00828nam a2200241 a 4500 59181 59181 BD-DhIDS 20261011113359.0 030619s1987 us 100 0 eng BD-DhIDS BD-DhIDS BD-DhIDS Eng US NAS NRC Vit Vitamin a supplementation : methodologies for field trials. Washington, DC : National Academy Press , 1987 xii, 91p. : ill. ; 23 cm. Includes bibliographical references and index. Also available via the Internet, as viewed October 4, 2002. Vitamin A deficincy Prevention Clinical trials Methodology National Research Council National Academy of Sciences Commission on Life Science BIDSN DC 0 0 BIDSN 0 0 NFIC BIDSLDC BIDSLDC DOC 1988-03-07 US NAS NRC Vit 075963 2026-10-11 C-01 2026-10-11 DC