United States. Children's Bureau
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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, Bureau Publication No. 217 ,
Washington, D.C:
Government Printing Office,
1933, https://fraser.stlouisfed.org/title/8493,
accessed on October 3, 2024.