Tripathi, A. K. text New Dlehi Ashish Publishing House 1993 monographic (v 1. 302 ; v 2. 278 ; v 4. 314p) ; 24cm(Hb) v 1. Air pollution ; v 2. Understanding Environmental disruption ; v 4 .Ecology and the environment edited by A. K. Tripathi Environmental protection -- Moral and ethical aspects Environmental protection 363.7 TRI 8170245249 A-597018 Cen Lib / Ret DPL En