P. R. R. shops’ Altoona, Pa. interior of locomotive black-smith shop.

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 assembled it over a period of more than six decades, Robert N. Dennis (1900-1983).

Stereographs consist of two nearly identical photographs or photomechanical prints, paired to produce the illusion of a single three-dimensional image, usually when viewed through a stereoscope. Stereographs were produced from the 1850s to the 1940s, with the bulk between 1870 and 1920.

pennsylvania pennsylvania railroad allegheny mountains railroad shops yards railroad locomotive industry altoona pa locomotive black smith shop shops high resolution bonine r a photographer railroad shops and yards stereoscopic views altoona shops altoona locomotive black smith shop united states allegheny railroad robert dennis collection of stereoscopic views 19th century history of pennsylvania design new york public library industrial history

1858 - 1900

New York Public Library

http://digitalcollections.nypl.org/

Creative Commons CC0 1.0 Universal Public Domain Dedication ("CCO 1.0 Dedication")