Davies- Colley, R. J. Colour and clarity of natural waters : science and management of optical water quality / R.J Davies- Colley, W.N. Vant and . D.G .Smith - Toronto : Ellis Horwood ; 1993. - xxiv, 310 pages illustrations includes index ISBN: 0131465805 Subjects--Topical Terms: Natural waters LC Class. No.: TD 433 / .D38 1993