West side, Triumph Hill, 50 derricks.

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 petroleum chemical industry environmental aspects petroleum industry the miriam and ira d wallach division of art prints and photographs photography collection west side triumph hill high resolution robbins frank 1846 1924 photographer stereoscopic views triumph hill derricks united states robert dennis collection of stereoscopic views 19th century history of pennsylvania industrial history new york public library

1858 - 1900

New York Public Library

http://digitalcollections.nypl.org/

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