Corvus corax subsp. principalis Ridgway, 1887 sec. Corvids of the World ContentDistribution Bibliography Distribution Northern America North-Central U.S.A. nativeA; Northeastern U.S.A. nativeA; Northwestern U.S.A. nativeA; Subarctic America nativeA Bibliography A. 2003: The Howard and Moore complete checklist of the birds of the world. 3rd Edition: 504-515
