Classification of Guthrie 1966

G. Bison Hamilton-Smith 1827 [bison]
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Bison crassicornis Richardson 1854
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Invalid names: Bison alaskensis Rhoads 1897 [synonym], Bison chaneyi Cook 1928 [synonym], Bison geisti Skinner and Kaisen 1947 [synonym], Bison preoccidentalis Skinner and Kaisen 1947 [synonym]
Bison occidentalis Lucas 1898