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Timothy O'Sullivan

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, No. 38 from the series "Geographical Explorations and Surveys West of the 100th Meridian"

1874
Albumen print, stereo
9.2 × 7.4 cm (3.6 × 2.9 in)

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In the collection of Art Institute of Chicago, Chicago · as of July 2026

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