Verma, P.S. .
Principles of ecology (Environmental biology) / by P.S. Verma and V.K. Agarwal. - New Delhi : S.Chand & Co. Ltd., , 1983 - 591p ;
Ecology
G:5 / M3
Principles of ecology (Environmental biology) / by P.S. Verma and V.K. Agarwal. - New Delhi : S.Chand & Co. Ltd., , 1983 - 591p ;
Ecology
G:5 / M3