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  1. 1
    Proceedings of the second Pan American scientific congress : child labor and public health /

    Proceedings of the second Pan American scientific congress : child labor and public health / by Lovejoy, Owen R.

    Subjects:
    Article
  2. 2
    Congreso Científico Panamericano (2 : 1915-1916 : Washington).

    Congreso Científico Panamericano (2 : 1915-1916 : Washington).

    Published 1917
    Subjects:
    Conference Proceeding Book

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