Search for water parasites to be used for experiments. U.S.D.A. Experi...
Public domain photograph of Great Depression era, artistic, art photography, free to use, no copyright restrictions image - Picryl description
Dr. G.W. Carver at Work in His Laboratory
Picryl description: Public domain image of a great depression era, migrant workers, free to use, no copyright restrictions.
Gen. Butler's experiments with the Sawyer rifled cannon. . .
Picryl description: Public domain historical book on American Civil War, free to use, no copyright restrictions image.
Boston Water works, Sudbury River Conduit, Nov. 6, 1876, south end of ...
Boston Massachusetts 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 Yo... More
Search for water parasites to be used for experiments. U.S.D.A. Experi...
Public domain photograph of Great Depression era, artistic, art photography, free to use, no copyright restrictions image - Picryl description
Boston Water works, Sudbury River Conduit, Nov. 6, 1876, south end of ...
Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description
Boston Water works, Sudbury River Conduit, Nov. 6, 1876, south end of ...
Boston Massachusetts 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 Yo... More
Boston Water works, Sudbury River Conduit, Nov. 6, 1876, south end of ...
Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description