National Geographic : 1915 Jul
Courtesy oftheGreat Northern Railroad BLACKFEET POINTING TO MT WILBUR, PTARMIGAN LAKE: GLACIERNATIONAL PARK This region has been called the roof of North America. In its mountains are eighty living glaciers. From their heights thewaters divide and flow into the Gulf of Mexico, Hudson Bay, and the Pacific Ocean. Within the park are 250glacier-fed blue mountain lakes and scores of silvery streams.