00542nam a22001698a 4500008004200000020001500042100002400057245007800081260005400159300002600213500002000239650002900259650003000288650001800318650001400336050002200350881213s1989    ne       b    001 0 eng  0  a81203289381 aRao, Venugopala P.,10aPrinciples of environmental science and engineering /cP. Venugopala Rao.  aNew York :bPHI Learning Private Limited ;c2006.  axii, 276 p. :bill. ;  aIncludes index. 0aEnvironmental protection 0aEnvironmental engineering 0aHuman ecology 0aPollution00aTD170b.J67 1989X