History: A geological surveyor explores the lower basin of Mammoth Hot Springs in Yellowstone (1870) [1200 x 687]

https://i.redd.it/dpoh369aounx.jpg via /r/HistoryPorn https://www.reddit.com/r/HistoryPorn/comments/54jz74/a_geological_surveyor_explores_the_lower_basin_of/?utm_source=ifttt