Tourist Maps of Yellowstone National Park and Waterton-Glacier International Peace Park, 1947

Yellowstone National Park, established 1872, was America's first national park. After automobiles were allowed in the national parks (Yellowstone in 1915), attendance increased dramatically. The growing popularity of Yellowstone, like other parks, led to improvements in roads, campgrounds, parking lots, supply stations, and restrooms--along with an increase in tourist guides and maps like this one produced by Texaco.