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  1. The influence of yeast upon fertility and hatchability of hens' eggs.
    By: Lewis, Harry Reynolds,
    Publication info: New York,Fleischmann Co.[192-?]
    Contributed by: Cornell University Library
    Subjects: Birds  Embryology  Feeding and feeds  Fertility  Poultry  Yeast  
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  2. The law of births and deaths; being a study of the variation in the degree of animal fertility under the influence of the environment, by Charles Edward Pell.
    By: Pell, Charles Edward.
    Publication info: London,T. F. Unwin, ltd.[1921]
    Contributed by: University of California Libraries (archive.org)
    Subjects: Fertility  
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  3. The population problem; a study in human evolution.
    By: Carr-Saunders, A. M.
    Publication info: Oxford,Clarendon Press,1922.
    Contributed by: Kelly - University of Toronto (archive.org)
    Subjects: Anthropology  Biology  Evolution  Fertility  Population  
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  4. The population problem; a study in human evolution.
    By: Carr-Saunders, A. M.
    Publication info: Oxford :Clarendon Press,1922.
    Contributed by: University of California Libraries (archive.org)
    Subjects: Anthropology  Biology  Evolution  Fertility  Population  
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  5. The population problem; a study in human evolution.
    By: Carr-Saunders, A. M.
    Publication info: Oxford,Clarendon Press,1922.
    Contributed by: NCSU Libraries (archive.org)
    Subjects: Anthropology  Biology  Evolution  Fertility  Population  
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