00380 a2200145 4500 8176292362 363.7372 SIN 15216 22887 Singh, Gurcharan Pollution to purity of environment New Delhi Deep & Deep publication 2000 2000 viii,124p. 21cm Environmental Pollution PR 43342 43342 0 0 0 0 REF MKDL MKDL REF 2009-03-20 0 363.7372SIN 54655 2009-03-20 00:00:00 0.00 2016-10-31 PR