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
300.72 W187 81868
Wall W D Longitudinal studies and the social sciences London Heinemann 1970 x,245p. 0435828479 * Longitudinal method Social sciences-research * Williams H L, Auth. * Title