Attributes / relations provided by
♦ ¹Microtus ochrogaster, Dick T. Stalling, MAMMALIAN SPECIES No. 355, pp. 1-9 (1990)
♦ ²An Ecological Survey of Endemic MOUNTAIN BEAVERS (Aplodontia rufa) in California, 1979-83, Dale T. Steele', State of California, THE RESOURCES AGENCY, Department of Fish and Game