00493    a2200145   4500020001500000082001400015100002200029245010000051250001200151260003100163300002900194650001600223999001500239952009300254  a0471030589  a631.7 HAN  aHansen, Vaughn E.  aIrrigation principles and practices /cVaughn E. Hansen, Orson W. Israelsen, Glen E. Stringham.  a4th ed.  aNew York :bWiley,cc1980.  a417 p. :bill. ;c24 cm.  aIrrigation.  c1628d1628  00104070aNITbNITcCEd0000-00-00l0o631.7 HANpNIT-957 r2017-01-05w2017-01-05yBK