00428nam a2200133Ia 4500008004100000082001800041100002000059245003500079260006500114300000800179650004100187650003400228653003200262170901s1972    xx            000 0 und d  a630.717bS48S  aSinha, P. R. R. 0aStudies in Extension Education  aHyderabadbNational Institute of Community Developmentc1972  a151  aAgriculture and related technologies  aTechnology (Applied sciences)  aAgricultural extension work