00433nam a22001337a 4500008004100000040005500041080002100096100001800117245004600135260006400181300001000245650001300255653003100268230616b        |||||||| |||| 00| 0 eng d  aNational Science LibrarycNational Science Library  a621.65.001.5bM51 aYau, Goh Sing  aLaboratory and field testing of handpumps  aOttawa: bInternational Development Research Centre, c1985  a138p.  aHandpump  aExperimental investigation