Progress in ecology :  selected and invited papers read at the symposium on advancement of ecology held at D.A.V. College, Muzaffarnagar December 8-10, 1976 / 
editors V.P. Agarwal and V.K. Sharma 
 - New Delhi :  Today & Tomorrow's Printers and Pub,  1980 
 - v. :  ill. ;  21 cm.