Attributes / relations provided by
♦ 1Microtus oregoni, Leslie N. Carraway and B. J. Verts, Mammalian Species No. 233, pp. 1-6 (1985)
♦ 2Clethrionomys californicus, Lois F. Alexander and B. J. Verts, MAMMALIAN SPECIES No. 406, pp. 1-6 (1992)
♦ 3Sorex vagrans, Scott W. Gillihan and Kerry R. Foresman, MAMMALIAN SPECIES No. 744, pp. 15 (2004)