North American tundra. 77?^ map also shows the position of the summer Arctic Front 

 and sites referred to in this volume: 1-4) U.S. Tundra Biome research areas, 5) Banks 

 Island, 6) Devon Island, 7) Axel Heiberg, 8) Mackenzie River, 9) Aleutian Islands, 10) 

 Yukon River. Eagle Summit (3) is located in the Yukon-Tanana Uplands. The shaded 

 portion of the map depicts areas of alpine tundra only, while the Alaskan map opposite 

 depicts all tundra or treeless regions. (After Komdrkovd and Webber 1978.) 



