1) The title continues, "From Maps by the U.S. Geological Survey.", Julius Bien & Co. Lith. N.Y. This beautifully colored topographical map was issued by the Park Superintendent after maps by the U.S. Geological Survey. It shows the entire park in great detail at a scale of four miles per inch. Legend identifies ranger stations, snowshoe cabins, existing roads, unused roads, trails and more. It locates the remote Shoshone, Lewis and Heart Lakes; names the Upper, Shoshone, Gibbon, and Heart Lake Geyser Basins, Mud Geysers, Mammoth Hot Springs, and much more. There is terrific detail of topography with contour intervals at 100 feet, watershed and numerous features. (19 x 18").

2) The title continues, "Prepared under the Direction of Captain H.M. Chittenden…", Norris Peters Co., New York. We've not before seen this fabulous large scale map focused on the Mammoth Hot Springs area. The details, drawn on a scale of 100 feet per inch, is exceptional including contour lines every five feet! Locates the buildings around the main hotel including the Cottage Hotel, numerous support buildings, U.S. Commissioner's residence, roads, living quarters and much more. This map extends to also locate the Electric Light Power House, Ice Houses, the Old Quartermaster's Department buildings, McCartney's Log House, and the Flume & Aqueduct. There is an attractive compass rose and fleur-de-lys. A most uncommon map that will be an important addition to any Yellowstone collection. (41.5 x 33.3").

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Condition: A+

Both with fine impression and coloring. Folding as issued.