Water pollution /
Tripathi, A. K.
Water pollution / by A K Tripathi & S N Pandey. - New Delhi : Ashish Publishing House ; 1990. - ix ; 326 p., 22 cm.
8170242673
589.35222 / TRI
Water pollution / by A K Tripathi & S N Pandey. - New Delhi : Ashish Publishing House ; 1990. - ix ; 326 p., 22 cm.
8170242673
589.35222 / TRI