Online Public Access Catalogue (OPAC)Library,Documentation and Information Science Division
“A research journal serves that narrow
borderland which separates the known from the unknown”
-P.C.Mahalanobis
1(8) O18758
United States. Department of Health, Education, and Welfare Plan and operation of a health examination survey of US youths 12-17 years of age Washington :National Center for Health Statistics ,1969