Downing, Elaine P. <br/><br/>
Annotated bibliography of lake Ontario limnological and rel-ated studies. vol.II biology / by Elaine P. Downing, James -E. Hassan, Robert A. Sweeney 

 - Washington, D.C. : Environmental Protection Agency 
 - [240] p. 
 - Ecological research series ; EPA-R3-73-028b .