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U.S. Department of Agriculture
National Invasive Species Information Center
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Invasive Species Resources

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Chesapeake Bay Introduced Species Database
Smithsonian Institution. Smithsonian Environmental Research Center. Marine Invasions Research Lab. National Exotic Marine and Estuarine Species Information System (NEMESIS).
Non-Indigenous Species List Generator
DOC. NOAA. Great Lakes Environmental Research Laboratory. Great Lakes Aquatic Nonindigenous Species Information System (GLANSIS).
Redwood National and State Parks - Exotic Plant Species List
DOI. National Park Service.