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 - Eliot, Martha M. (Martha May), 1891-; United States. Children's Bureau (Washington, U.S. Govt. print. off., 1933)
At head of title: United States Department of labor. Frances Perkins, secretary. Children's bureau. Grace Abbott, chief.