00489nam a2200169Ia 4500008004100000082001800041100001700059245003600076260004400112300000800156650004100164650003400205653003200239653001300271700001800284700001700302170901s1970    xx            000 0 und d  a630.717bS48R  aSingh, K. N. 0aResearch in Extension Education  aNew DelhibCaxton Press Pvt. Ltd.c1970  a496  aAgriculture and related technologies  aTechnology (Applied sciences)  aAgricultural extension work  aResearch  aRao, C. S. S.  aSahay, B. N.