00285nam a2200109Ia 450000500170000000800410001708200150005810000180007324500380009126000380012930000080016720260224041012.0260224s9999||||xx |||||||||||||| ||und||  a631.45 SCH  aSchwab, G.O.  0aSoil and water management systems  aNew York: John Wiley & Sonsc1996  a371