Methods and measurements of periphyton communities /  a review... 
R.L. Weitzel, editor 
 - America  America Society for Testing and Materials  1979 
 - 183p.  ill.  23cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>0000000017  RM76.80 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Periphyton--Communities