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zebra mussels 2004
zzebra mussels 2004
Source: U.S. Geological Survey
http://cars.er.usgs.gov/Nonindigenous_Species/ZM_Progression/zm_progression.html

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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/images/zebra_mussels_2004.html