An Annotated Key to the Identification of 

 Commonly Occurring and Dominant Genera 

 of Algae Observed in the Phytoplankton 

 of the United States 



• 6 



By PHILLIP E. GREESON 



GEOLOGICAL SURVEY WATER-SUPPLY PAPER 2079 



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UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON: 1982 



