Hot springs of the Yellowstone National Park. . . microscopic examinations by. . . . de [YELLOWSTONE NATIONAL PARK -- SCIENCE]. ALLEN, E.[ugene] T.[homas], DAY, Arthur L.[ouis]; MERWIN, H.[erbert] E.[ugene] - 1935.

[Washington, D.C.]: Carnegie Institution of Washington, 1935. Thick 4to. 9 x 11.5 x 1.75 in. xviii, 525, [1] pp. Photo frontisp., 215 photos, illustrtions. Thick printed light gray softcovers, Carnegie Institution lozenge front cover, black lettering front cover, spine (some minor edgewear, scuffing, rubbing & creasing to spine, minor curling to corners, very slight spotting front cover, inner hinges reinforced w/ white linen hinges), still VG copy, w/ former ownership marking upper fore-edge front cover. First edition of this groundbreaking investigation into the geysers, hot springs, mud pots, fumaroles and steam vents of Yellowstone National Park containing more than 10,000 of these features. These original investigations were encouraged by Yellowstone Superintendent Horace Albright who believed such studies to be vital to monitoring all of Yellowstone’s geophysical systems. Fresh off their Volcanic Activity and Hot Springs of Lassen Peak monograph, the two geologists were able to produce this extraordinary compilation of water chemistry and physical descriptions of the hydrothermal features and surrounding geology, filled with contemporary photographs of the Park. See: Ken Sims, Science Cowboys: The Adventures of Yellowstone’s Early Geologists, Caldera Chronicles, Yellowstone Volcano Observatory, Dec. 23, 2019; Blaine McCleskey, The Diverse Chemistry of Yellowstone’s Hydrothermal Features, Caldera Chronicles (Dec. 18, 2019).