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, Mud Geysers, Mammoth Hot Springs are named. Old Faithful Hotel is noted.
A nice example with a bit of excess ink along the top border. Issued folding.