Distribution of public herds of plains bison (Bison bison bison) and of free-ranging or captive breeding wood bison (Bison bison athabascae) in North America as of 2003.
  Wood bison
  Plains bison
North America second level political division 2.svg
Wild mammals of North America : biology, management, and conservation.  George A Feldhamer; Bruce Carlyle Thompson; Joseph A Chapman. Baltimore, Md. : Johns Hopkins University Press, 2003.  (ISBN 9780801874161) (OCLC 51969059)
Cephas