Through the Looking Glass: A Field Guide to Aquatic Plants – by the Wisconson Lakes Partnership
https://nysfola.org/books/
Common Aquatic Invasive Species of NY
https://www.dec.ny.gov/animals/265.html#Aquatic
A Field Guide to Common Aquatic Plants of PA
http://pubs.cas.psu.edu/FreePubs/pdfs/agrs110.pdf
Pennsylvania Field Guide to Aquatic Invasive Species
http://www.paseagrant.org/projects/pennsylvanias-field-guide-to-aquatic-invasive-species/
Maine Field Guide to Invasive Aqutic Plants and their common native look alikes – https://lakestewardsofmaine.org/mciap/FieldGuide.pdf
Finger Lakes PRISM Invasive Species Field Guide – http://fingerlakesinvasives.org/wp-content/uploads/2018/08/FieldGuide_Final-1.pdf
A list of other resources can be found at: https://www.imapinvasives.org/identification-guides