These three maps were issued in the Geological Survey's monograph on Yellowstone National Park under the direction of Charles D. Walcott.

A. Topography Sheet XVIII - Mammoth Hot Springs and Vicinity (14.3 x 17.4"). Depicts the Mammoth Hot Springs Hotel and adjacent military quarters near the center of the image. Shows several roads in the vicinity including: Road to Snow Gate, Stage Road to Geyser Basin, Road to Geyser Basin, Road to Tower Falls, and Road to Gardiner. The map features highly detailed topography showing the rugged nature of the area with numerous lakes and ponds depicted throughout.

B. Geology Sheet XIX - Mammoth Hot Springs and Vicinity (14.4 x 17.4"). Includes the base topographical map from above with the addition of 12 different geological groups identified by color and texture.

C. Topography Sheet XX - Detail Map of Mammoth Hot Springs Travertine Terraces (18.6 x 31.4"). Double-page map enlarged to focus on the vicinity around the hotel and military quarters. Shows additional buildings including a hospital, cottage, stable, and others. Drawn on a scale of 200 feet per inch.

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Condition: B+

There is pleasant light toning which is more prominent along sheet edges, and a few minor edge chips confined to the blank margins.