Vitamin a supplementation :  methodologies for field trials. 

 - Washington, DC :  National Academy Press ,  1987 
 - xii, 91p. :  ill. ;  23 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vitamin A deficincy--Prevention<br/>Clinical trials--Methodology
<br/><br/><label>Gov. Doc. Class. No.: </label>US NAS NRC Vit