Attributes / relations provided by
♦ 1Microtus townsendii, John E. Cornely and B. J. Verts, MAMMALIAN SPECIES No. 325, pp. 1-9 (1988)
♦ 2Napaeozapus insignis, John O. Whitaker, Jr., and Robert E. Wrigley, MAMMALIAN SPECIES No. 14, pp. 1-6 (1972)
♦ 3Sylvilagus audubonii, Joseph A. Chapman and Gale R. Willner, MAMMALIAN SPECIES No. 106, pp. 1-4 (1978)