Chhatwal, G.R.. Encyclopaedia of environmental management Vol.1. / by G.R.Chhatwal. - 1st ed / - New Delhi : Anmol Publications Pvt.Ltd. , 1971 - vii,411p ; ISBN: 81-7488-648-6 Subjects--Topical Terms: Life Science Dewey Class. No.: G:55(X:8)k / N8.1