Edwards, R. W. <br/><br/>
Conservation ad Productivity of Natural Waters 
Edited by R. W. Edwards and D. J.Garrod 
 -  Academic Press Inc.; London  1972 
 - xv, 318p.; ill, diagrs. pictures & ables 
<br/><br/> Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>126133298