00548nam a2200169Ia 4500008004100000010001200041040001700053082002100070100002300091245006300114260003100177300001600208440005900224650005000283700002500333700002000358190327s9999||||xx |||||||||||||| ||und||  a55-8300  aNITILcNITIL  221sta627bF891S  aFrevert, Richard K 0aSoil and water conservation engineeringcRichard K Frevert  aNew YorkbJohn Wileyc1955  axiii, 479p.  aThe foreign founations agricultural engineering series  aSoil; Water conservation; Subsurface drainage  aEdminster, Talcott W  aSchwab, Glenn O