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  1. Geographic variation in some reproductive characteristics of diurnal squirrels. Bulletin of the AMNH ; v. 122, article 1
    By: Moore, Joseph Curtis.
    Publication info: New York : [American Museum of Natural History] 1961
    Subjects: Classification  Climatic factors  Mammary glands  Reproduction  Squirrels  Variation  
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  2. The mammary apparatus of the mammalia : in the light of ontogenesis and phylogenesis /
    By: Bresslau, E. - Hill, James Peter,
    Publication info: London :Methuen & Co.,1920.
    Subjects: Mammals  Mammary glands  
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  3. Morphology, function, and phylogenetic significance of pubic nipples in bats (Mammalia, Chiroptera). American Museum novitates ; no. 3077
    By: Simmons, Nancy B.
    Publication info: New York, N.Y. : American Museum of Natural History 1993
    Subjects: Bats  Mammals  Mammary glands  Morphology  
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