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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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A Brief Guide to Kentucky's Non-Native, Invasive Species, Common Weeds, and Other Unwanted Plants (PDF | 4.7 MB)
Louisville Water Company.
Introduced Marine Species of Hawai'i
Bishop Museum. Hawaii Biological Survey; University of Hawaii.
Pocket Field Guide to Kentucky's Common Weeds (PDF | 1.59 MB)
Louisville Water Company (Kentucky).
See also: Guides for Plants, Landscaping and Insects for more guides
Weeds of Hawai'i's Pastures and Natural Areas: An Identification and Management Guide - Schinus terebinthifolius (2003) (PDF | 240 KB)
University of Hawaii. College of Tropical Agriculture and Human Resources.
See also: Weeds of Hawaii for more species guides