life zones [...] tropical [...] lower austral [...] upper austral [...] transition [...] Canadian [...] Hudsonian [...] arcticalpine
Merriam, C.H. (1890). Results of a biological survey of the San Francisco mountain region and the desert of the Little Colorado, Arizona. U.S.D.A., Div. Ornithol. & Mammal., N.A. Fauna, 3, 1-136: 2; 20; id. (1892). The geographical distribution of life in North America, with special reference to the Mammalia. Proc. Biol. Soc. Wash. 7, 1-64; id. (1899). Life zones and crop zones of the United States. U.S.D.A., Div. Biol. Surv. Bul. 10, 9-79; cf. Daubenmire, R. (1938). Merriam’s life zones of North America. Quart. Rev. Biol. 13, 327-332; Peterson, R.T. (1942). Life zones, biomes, or life forms? Audubon 44, 21-30; Shelford, V.E. (1945). The relative merits of the life zone and biome concepts. Wilson Bulletin 57, 248-252.