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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Perkins, Henry Farnham,
    Publication info: Philadelphia, 1903
    Holding Institution: The Johns Hopkins University Sheridan Libraries
  2. By: International Eugenics Congress New York) - Perkins, Henry Farnham, - Laughlin, Harry Hamilton,
    Publication info: Baltimore, The Williams & Wilkins company, 1934
    Holding Institution: MBLWHOI Library