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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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Managing Invasive Species: How Much Do We Spend? (Jul 2012) (PDF | 2.04 MB)
University of Alaska Anchorage. Institute of Social and Economic Research.
The Economics of Invasive Species (2009) (PDF | 436 KB)
Oregon Sea Grant; Oregon State University; DOC. National Oceanic and Atmospheric Association.
Prepared for the Oregon Invasive Species Council. See also: Strategic Plans, Action Plans, and Annual Reports for more resources
The Problem With Invasive Plants
City of Portland (Oregon). Environmental Services.
Wild Plants - Invasive Plants

Pennsylvania Department of Conservation and Natural Resources.