Geographic Variation

  1. Geographic Variation in the Pocket Gopher, Thomomys bottae, in Colorado

    Phillip M. Youngman

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  2. Geographic Variation in Red-backed Mice (Genus Clethrionomys) of the Southern Rocky Mountain Region

    E. Lendell Cockrum

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  3. Geographic Variation in the Pocket Gopher, Cratogeomys castanops, in Coahuila, México

    Rollin H. Baker

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  4. Geographic Variation in the North American Cyprinid Fish, Hybopsis gracilis

    Frank B. Cross

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  5. Geographic Variation in the Harvest Mouse, Reithrodontomys megalotis, On the Central Great Plains And in Adjacent Regions

    J. Knox Jones

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