00511    a2200157   4500020001500000082001700015100002000032245005800052260004800110300001700158650005700175650001500232650003500247650004000282650003100322  a0946688745  a631.587bSTE  aStern, Peter H.  aOperation and maintenance of small irrigation schemes  aLondonbIntermediate Technologyc1988g1988  av,45p.c21cm  aSpecific techniques, apparatus, equipment, materials  aIrrigation  aSpecial methods of cultivation  aOperations subsequent to harvesting  aCultivation and harvesting