Katz, Sharon <br/><br/>
The Great Lakes / 
by Sharon Katz. 
 - Tarrytown, NY :  Benchmark Books,  1999. 
 - p.  cm. 
 - Ecosystems of North America .
<br/><br/> Summary: Describes the formation of the Great Lakes, the varied life forms that are part of this ecosystem, the interactions among the plants and animals that live there, and threats to this environment. 
<br/><br/><label>ISBN: </label>0-7614-0898-3 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology--Great Lakes<br/>Freshwater ecology