https://maisrc.umn.edu/curlyleaf-pondweed

University of Minnesota. Minnesota Aquatic Invasive Species Research Center.

https://aquaplant.tamu.edu/plant-identification/alphabetical-index/curly-leafed…

Texas A&M University. AgriLife Extension Service. Department of Wildlife and Fisheries Sciences.

https://www.eddmaps.org/distribution/usstate.cfm?sub=6219

University of Georgia. Center for Invasive Species and Ecosystem Health.

https://www.invasiveplantatlas.org/subject.html?sub=6219

University of Georgia. Center for Invasive Species and Ecosystem Health.

https://nas.er.usgs.gov/viewer/omap.aspx?SpeciesID=1134

DOI. USGS. Wetland and Aquatic Research Center.

Provides detailed collection information as well as animated map.

https://plants.usda.gov/home/plantProfile?symbol=POCR3

USDA. NRCS. National Plant Data Center.