Freshwater quality :  defining the indefinable? / 
edited by P.J. Boon and D.L. Howell. 
 - Edinburgh :  HMSO,  1997. 
 - xx, 552 p. :  col. ill. 
<br/><br/><label>ISBN: </label>0114952701 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Analysis.<br/>Water quality--Measurement.<br/>Water quality management