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U.S. Fish and Wildlife Service regions
U.S. Fish and Wildlife Service regions
The Upper Mississippi River System with lock and dams numbered
The Upper Mississippi River System with lock and dams numbered
Upper Mississippi River System
Upper Mississippi River System
rivers of the Chicago, Illinois area
rivers of the Chicago, Illinois area
Floodplains of the Upper Mississippi River System
Floodplains of the Upper Mississippi River System
Inland waterway system
Inland waterway system
zebra mussels 1988
zebra mussels 1988
zebra mussels 2002
zebra mussels 2002
zebra mussels 2004
zebra mussels 2004
   

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Department of the InteriorU.S. Fish & Wildlife ServiceU.S. Geological Survey
Last updated on July 8, 2005
http://www.fws.gov/midwest/mussel/image_library_maps.html