Zebra Mussel Distribution in North America The concern caused by the explosive spread of the zebra mussel, (Dreissena polymorpha), within the United States resulted in passage of the Nonindigenous Aquatic .. U.S. Geological Surveyhttp://nationalatlas.gov/zebram.html- 44.9KB - USGS
Zebra Mussel Resources
Zebra Mussel Resources
Zebra Mussel Information
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Zebra mussel veligers were identified .. http://nas.er.usgs.gov/zebra.mussel/- 11.9KB - USGS
Invasion of the Zebra Mussel in the United States Invasion of the Zebra Mussel in the United States
Invasion of the Zebra Mussel in the United States
by
Amy J. Benson
National Biological Service
Charles P. .. http://biology.usgs.gov/s+t/frame/x274.htm- 13.2KB - USGS
1:2,000,000-Scale Hydrologic Unit Boundaries This file contains hydrologic unit boundaries and codes for the United States, Puerto Rico, and the U.S. Virgin Islands. It was revised for inclusion in the .. U.S. Geological Surveyhttp://nationalatlas.gov/hucsm.html- 76.4KB - USGS
1:2,000,000-Scale Hydrologic Unit Boundaries This file contains hydrologic unit boundaries and codes for the conterminous United States along with Alaska, Hawaii, Puerto Rico and the U.S. Virgin ... U.S. Geological Surveyhttp://water.usgs.gov/GIS/metadata/usgswrd/huc2m.html- 55.0KB - USGS
West Nile Virus Maps - nationalatlas.gov Maps Showing West Nile Virus Distribution 2000 - The National Atlas of the United States of America U.S. Geological Survey (USGS)http://nationalatlas.gov/virusmap.html- 9.6KB - USGS