00553nam a2200181 a 450000500170000000800410001702000150005804100080007308200110008110000230009224500480011525000120016326400540017530000330022950000510026265000160031365000420032920260717091718.0260717s1980    ii            000 0 eng d  a9971511738  aeng04a551.491 atodd, David. Keith10aGroundwater hydrology /ctodd, David. Keith  a2nd ed. 1aNew york :bJohn Wiley & Sons, INC. &sons,c1980.  axiii, 535 p. ; ill. ; 24 cm.  aIncludes bibliographical references and index. 4aGroundwater 4aGroundwater flow--Mathematical models