00422nam a2200157Ia 4500008004100000082001800041100001400059245003600073250000600109260003400115300000700149650003800156650003400194653002600228653001000254170901s1986    xx            000 0 und d  a621.252bS11E  aSahay, J. 0aElements of Pumps and Tubewells  a1  aPatnabAgro Book Agencyc1986  a62  aEngineering and allied operations  aTechnology (Applied sciences)  aHydraulic engineering  aPumps