Grotto Geyser Cone After Eruption, Upper Geyser Basin,Yellowstone National Park.

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 grotto geyser wyo grotto geyser cone upper geyser basin high resolution stereoscopic views grotto geyser cone eruption upper basin yellowstone park united states robert dennis collection of stereoscopic views 19th century images of yellowstone national park national parks new york public library

1858 - 1900

New York Public Library

http://digitalcollections.nypl.org/

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