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  1. 1
    Published 1917
    Boston, American public health association, 1917.
    115 p. 25 cm.
  2. 2
    Published 1923
    New York : American public health association, 1923.
    vii, 111 p., iii ; 24 cm.
  3. 3
    Published 1925
    New York : The Association, 1925.
    xi, 119 p. : diagr. ; 25 cm.
  4. 4
    Published 1920
    Boston, American public health association, 1920.
    vii, 115 p. 24 cm.

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