00589nam a2200121Ia 4500008004100000040004400041100001900085245015200104260003900256300001000295600014700305999001500452180412s9999||||xx |||||||||||||| ||und||  aAhmadu Bello University Library - Zaria  aHENDERSON, Kay 0aPollution; sources of information. Proceedings of a one day conference held at the Library  Association London on 27th October 1971.cKay Henderson  bLibrary Association; London.c1972  a101p.  aImpurity, pollution, nuisances, offensive trades. General purification of the air. Metal and their inorganic compounds. Non-metallic elements.  c1819d1819