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Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft. across ...).

Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft....

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Above Horseshoe Curve. Stereoscope card.

Pennsylvania Railroad, Above Horseshoe Curve. Stereoscope card.

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft. across ...).

Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft....

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Above Horseshoe Curve. Stereoscope card.

Pennsylvania Railroad, Above Horseshoe Curve. Stereoscope card.

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Neversink Curve, on P. & R.R. Philadelphia Reading Railroad. Stereoscope card.

Neversink Curve, on P. & R.R. Philadelphia Reading Railroad. Stereosco...

Philadelphia stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Pack Saddle Curve. Stereoscope card.

Pennsylvania Railroad, Pack Saddle Curve. Stereoscope card.

Picryl description: Public domain image of railway tracks, train station, railroad building, free to use, no copyright restrictions.

The Horseshoe Curve, Pennsylvania. 19th century stereoscopic views of Pennsylvania.

The Horseshoe Curve, Pennsylvania. 19th century stereoscopic views of ...

Picryl description: Public domain image of railway tracks, train station, railroad building, free to use, no copyright restrictions.

Below, Lightning Curve, towards, Point Lookout, on the B. G. R. R.

Below, Lightning Curve, towards, Point Lookout, on the B. G. R. R.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve, above Altoona. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve, above Altoona. Stereoscope ca...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft. across ...).

Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft....

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Below, Lightning Curve, towards, Point Lookout, on the B. G. R. R.

Below, Lightning Curve, towards, Point Lookout, on the B. G. R. R.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Neversink Curve, on P. & R.R. Philadelphia Reading Railroad. Stereoscope card.

Neversink Curve, on P. & R.R. Philadelphia Reading Railroad. Stereosco...

Philadelphia stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

The Horse Shoe Curve. 19th century stereoscopic views of Pennsylvania.

The Horse Shoe Curve. 19th century stereoscopic views of Pennsylvania.

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft. across ...).

Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft....

Public domain reproduction of illuminated book page, free to use, no copyright restrictions image - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve, above Altoona. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve, above Altoona. Stereoscope ca...

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

Horse Shoe Curve. 19th century stereoscopic views of Pennsylvania.

Horse Shoe Curve. 19th century stereoscopic views of Pennsylvania.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve, above Altoona. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve, above Altoona. Stereoscope ca...

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Horse Shoe Curve. 19th century stereoscopic views of Pennsylvania.

Horse Shoe Curve. 19th century stereoscopic views of Pennsylvania.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Below, Lightning Curve, towards, Point Lookout, on the B. G. R. R.

Below, Lightning Curve, towards, Point Lookout, on the B. G. R. R.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

The Horseshoe Curve, Pennsylvania. 19th century stereoscopic views of Pennsylvania.

The Horseshoe Curve, Pennsylvania. 19th century stereoscopic views of ...

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

The Horse Shoe Curve. 19th century stereoscopic views of Pennsylvania.

The Horse Shoe Curve. 19th century stereoscopic views of Pennsylvania.

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve, above Altoona. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve, above Altoona. Stereoscope ca...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of the back of stereograph card, stereoscopic view, free to use, no copyright restrictions

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Neversink Curve, on P. & R.R. Philadelphia Reading Railroad. Stereoscope card.

Neversink Curve, on P. & R.R. Philadelphia Reading Railroad. Stereosco...

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft. across ...).

Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft....

Picryl description: Public domain image from Robert Dennis collection of stereoscopic prints, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve, above Altoona. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve, above Altoona. Stereoscope ca...

Picryl description: Public domain image of the back of stereograph card, stereoscopic view, free to use, no copyright restrictions

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Horse Shoe Curve. 19th century stereoscopic views of Pennsylvania.

Horse Shoe Curve. 19th century stereoscopic views of Pennsylvania.

Picryl description: Public domain artwork of horse, equestrian horse riding, free to use, no copyright restrictions image.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of the back of stereograph card, stereoscopic view, free to use, no copyright restrictions

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

The Horse Shoe Curve. 19th century stereoscopic views of Pennsylvania.

The Horse Shoe Curve. 19th century stereoscopic views of Pennsylvania.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve, above Altoona. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve, above Altoona. Stereoscope ca...

Picryl description: Public domain image of the back of stereograph card, stereoscopic view, free to use, no copyright restrictions

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Neversink Curve, on P. & R.R. Philadelphia Reading Railroad. Stereoscope card.

Neversink Curve, on P. & R.R. Philadelphia Reading Railroad. Stereosco...

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft. across ...).

Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft....

Picryl description: Public domain image from Robert Dennis collection of stereoscopic prints, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Above Horseshoe Curve. Stereoscope card.

Pennsylvania Railroad, Above Horseshoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

The Horse Shoe Curve. 19th century stereoscopic views of Pennsylvania.

The Horse Shoe Curve. 19th century stereoscopic views of Pennsylvania.

Picryl description: Public domain artwork of horse, equestrian horse riding, free to use, no copyright restrictions image.

The Horseshoe Curve, Pennsylvania. 19th century stereoscopic views of Pennsylvania.
Pennsylvania Railroad, Pack Saddle Curve. Stereoscope card.

Pennsylvania Railroad, Pack Saddle Curve. Stereoscope card.

Picryl description: Public domain image of railway tracks, train station, railroad building, free to use, no copyright restrictions.

Below, Lightning Curve, towards, Point Lookout, on the B. G. R. R.

Below, Lightning Curve, towards, Point Lookout, on the B. G. R. R.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of the back of stereograph card, stereoscopic view, free to use, no copyright restrictions

The Horseshoe Curve, Pennsylvania. 19th century stereoscopic views of Pennsylvania.

The Horseshoe Curve, Pennsylvania. 19th century stereoscopic views of ...

Picryl description: Public domain image of railway tracks, train station, railroad building, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft. across ...).

Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft....

Public domain reproduction of illuminated book page, free to use, no copyright restrictions image - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve, above Altoona. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve, above Altoona. Stereoscope ca...

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of the back of stereograph card, stereoscopic view, free to use, no copyright restrictions

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Below, Lightning Curve, towards, Point Lookout, on the B. G. R. R.

Below, Lightning Curve, towards, Point Lookout, on the B. G. R. R.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Below, Lightning Curve, towards, Point Lookout, on the B. G. R. R.

Below, Lightning Curve, towards, Point Lookout, on the B. G. R. R.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Below, Lightning Curve, towards, Point Lookout, on the B. G. R. R.

Below, Lightning Curve, towards, Point Lookout, on the B. G. R. R.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

Below, Lightning Curve, towards, Point Lookout, on the B. G. R. R.

Below, Lightning Curve, towards, Point Lookout, on the B. G. R. R.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Above Horseshoe Curve. Stereoscope card.

Pennsylvania Railroad, Above Horseshoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft. across ...).

Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft....

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Horse Shoe Curve. 19th century stereoscopic views of Pennsylvania.

Horse Shoe Curve. 19th century stereoscopic views of Pennsylvania.

Picryl description: Public domain image of the back of stereograph card, stereoscopic view, free to use, no copyright restrictions

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve. Stereoscope card.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Horse Shoe Curve, above Altoona. Stereoscope card.

Pennsylvania Railroad, Horse Shoe Curve, above Altoona. Stereoscope ca...

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description