00420nam a2200169 a 450000500170000002000180001708200160003510000270005124500350007825000120011326000300012530000250015550000500018060000080023085600060023885600060024420251203112409.0  a9781439862667  a577.27bPRI  aWalker, C.H...[et al.]  aPrinciples of ecotoxicologyb_  a4th ed.  aNew YorkbCRC Pressc2012  axxv,360p.c25cm.bPB  aincludes bibliographical references and index  bc_  f_  a_