Megard, Robert O. <br/><br/>
Rates of photosynthesis and phytoplankton growth in Shagawa lake, Minnesota / 
Robert O. Megard 
 - Washington :  United States Government Printing Office,  1973 
 - vii, 70 p. :  ill. ;  28 cm. 
 - EPA-R3-73-039 .
<br/><br/> July 1973 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Phytoplankton<br/>Water--Pollution
<br/><br/><label>Dewey Class. No.: </label>363.7394