00377nam a22001097a 4500008004100000020001800041100002300059245007200082260006000154300002600214650002700240231218b           ||||| |||| 00| 0 eng d  a9789386173225  aGupta, Om Prakash.  aElement of water pollution control engineering /cPrakash Om Gupta.  aNew Delhi:bKhanna Book Publishing Co. (P) Ltd.cc2019.  axxi, 901 p. :bill. :  aSewage disposal plants