00375nam a2200133Ia 4500008004100000020000700041040003000048082001300078100001500091245006500106260004000171300001600211650001400227190302s9999||||xx |||||||||||||| ||und||  c50  aKharagpur College Library  a540bDAR  aS. S. Dara 2aA textbook of Environmental Chemistry and Population Control  bS. Chand and companyaKolkatac1993  a262 p.bV.2  aChemistry