Weber, Cornelius I. <br/><br/>
Methods of collection and analysis of plankton and periphyton smales in the water polution surveillance system / 
Cornelius I. Weber 
 - Washington, D.C. :  United States Government Printing Office ,  1970 
 - 25 p. :  ill. ;  28 cm. 
<br/><br/> EPA-600/D-70-002 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plankton<br/>Aquatic environments
<br/><br/><label>Dewey Class. No.: </label>578.776