363.7394
M678J
           Mishra, Sheo Gopal
               Jaal pradushaan \ Sheo Gopal Mishra - Delhi : Gyan Ganga, 1994.
               126p.
                library has also new edition-2000

                ISBN: 81-85829-05-5

142528
                Subjects: Water-Pollution; Water pollution control industry; Water-Purification.