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State Board of Health, Raleigh, N. C.
Received November 17, 1940.
1 The studies and observations on which this paper is based were conducted with the support and under the auspices of the International Health Division of the Rockefeller Foundation and the General Education Board in cooperation with the North Carolina State Board of Health and State Department of Education and Duke University School of Medicine. The chemical determinations were carried out by Assistant Chemist Janet McAfee Ayres under the supervision of Chemist Dr. J. R. Klein in the Cooperative Nutrition Laboratory located in Duke University School of Medicine.
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