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  1. The recapitulation theory and human infancy,
    By: Davidson, Percy E.
    Publication info: New York city,Teachers college, Columbia university,1914.
    Contributed by: Cornell University Library
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  2. The recapitulation theory and human infancy, by Percy E. Davidson ...
    By: Davidson, Percy E.
    Publication info: New York city,Teachers college, Columbia university,1914.
    Contributed by: University of California Libraries (archive.org)
    View Book