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Detailed map of Yellowstone at the beginning of the 20th Century.

This finely detailed topographical map shows all of Yellowstone Park plus the region to the east up to Bighorn County, in today's Park County. It has good topographical detail with contour intervals at 100 feet at a scale of 1 inch = 4 miles.

The Upper, Shoshone, Gibbon, and Heart Lake Geyser Basins are named, along with the Mud Geysers, Mammoth Hot Springs and Old Faithful Hotel.