003450000a22001210004500020001500000082001600015100001300031245004300044260002700087260000900114300000800123650009200131  a8185421072  a630.715 RAY  aRay, G L  aExtension communication and management  aCalcutta, Naya prakash  c1991  a232  aExtension communication- management/ Extension communication/ Rural development - India