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Trapa natans U.S. Geological Survey http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=263
Trapa natans (Water chestnut) Invasive Plant Atlas of New England http://nbii-nin.ciesin.columbia.edu/ipane/icat/browse.do?specieId=25
Water chestnut VT Department of Environmental Conservation, Water Quality Division http://www.anr.state.vt.us/dec/waterq/lakes/htm/ans/lp_wc.htm
Water chestnut, Trapa natans ME Center of Invasive Aquatic Plants http://www.mciap.org/herbarium/WaterChestnut.php
Water Chestnut Invasive Species Identification Sheets USDA Natural Resources Conservation Service (CT) http://www.ct.nrcs.usda.gov/invas-factsheets.html