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Start Over You searched for: Copyright Public domain Remove constraint Copyright: Public domain Publication Year 1930 to 1939 Remove constraint Publication Year: <span class="from" data-blrl-begin="1930">1930</span> to <span class="to" data-blrl-end="1939">1939</span>

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3. The effect of tropical sunlight on the development of bones of children in Puerto Rico: a roentgenographic and clinical study of infants and young children with special reference to rickets and related factors

9. Excerpt from Fred Soper's diary

13. Letter from Fred L. Soper to Lewis Hackett