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  1. Evolution by atrophy in biology and sociology /
    By: Demoor, J. (Jean), - Massart, Jean, - Vandervelde, Emile,
    Publication info: London :K. Paul,1899.
    Holding Institution: University of California Libraries (archive.org)
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  2. Evolution by atrophy in biology and sociology,
    By: Demoor, J. (Jean), - Massart, Jean, - Mitchell, Chalmers, Mrs. - Vandervelde, Emile,
    Publication info: New York :D. Appleton and Company,1899.
    Holding Institution: University of British Columbia Library (archive.org)
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