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1 Title by Pell, Charles Edward.  

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  1. 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)
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