01052cam a2200277 a 4500 1146303 NUST - PNEC 20170116180848.0 951212s1996 paua b 001 0 eng 95062015 1566763770 DLC LIBRARY DLC TD764 .S64 1996 577.64 SPE Spellman, Frank R. Stream ecology and self-purification : an introduction for wastewater and water specialists / Frank R. Spellman. Lancaster, Pa. : Technomic Pub., c1996. xiii, 133 p. : ill. ; 24 cm. Includes bibliographical references (p. 127-129) and index. Stream self-purification. Stream ecology. ME, IME Publisher description http://www.loc.gov/catdir/enhancements/fy0646/95062015-d.html 7 cbc orignew 2 opcn 19 y-gencatlg ddc BK 64520 64520 0 0 ddc 0 0 PNEC PNEC WING-A 0000-00-00 0 577.64 SPE PNECLIB-026982 2015-08-24 0000-00-00 BK