One of the group of Pagosa Hot Springs, showing incrustation on the surface. Much prized by the Indians and miners on account of supposed healing qualities. Principal mineral element, Sulphate of Soda.

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.

expeditions surveys geographical surveys west of the 100th meridian u s pagosa hot springs geographical surveys west of the 100th meridian u s publisher o sullivan timothy h 1840 1882 photographer expeditions and surveys stereoscopic views group pagosa hot springs incrustation surface indians miners account qualities principal element sulphate soda surveys expeditions robert dennis collection of stereoscopic views 19th century ultra high resolution high resolution new york public library

1874 - 1874

New York Public Library

https://digitalcollections.nypl.org/

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