Sentinel Rock. Wyoming stereoscope card, 19th century.

Wyoming 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.

wyoming yellowstone national park national parks reserves sentinel rock marshall william i william isaac 1840 1906 publisher national parks and reserves stereoscopic views sentinel rock united states robert dennis collection of stereoscopic views 19th century ultra high resolution high resolution

1876 - 1876

New York Public Library

https://digitalcollections.nypl.org/

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