Gray, N F. Water technology : an introduction for environmental scientists and engineers / by N F Gray. - 2nd ed / . - NewDelhi : Elsevier India , 2006. - xvii,645p. : ills.,charts,picts.,maps,tables ; 24cm 1 CD . Inclydes bibliographical references and index ISBN: 9788131202128 RS 550.00 Subjects--Index Terms: WATER RESOURCES DEVELOPMENT Dewey Class. No.: 621.20422 / GRA/W