00809nam a22002177a 4500003000500000005001700005008004100022010001000063011001000073035001000083040000900093082001500102110003700117245001300154260003800167300001900205490004800224500025800272650001300530830004800543CHAP20220329135820.0971013s1959            r     00010     d  a42737  a43709  a47846  cCHAP  a631.6bE83  aE.U.A. Soil Conservation Service  aDrainage  aWashington :bThe Service,c1959-  a12 v.b: ilus.  aNational Engineering handbook sectionv; 16  aLa biblioteca tiene: v.1 Principles of draninage.-- v.2 Drainage survey, investigations and reports.-- v.3 Subsurface drainage of irrigated land in arid and semi-arid areas.--v.4 Subsurface drainage in humid areas.--v.5 Tile systems and appurtenances.--14aDrenaje.0 aNational Engineering handbook sectionv; 16