Columbia subject headings:
Aquatic ecology--United States.
Aquatic habitats--United States--Classification.
Wetland ecology--United States.
Wetlands--United States--Classification.
Harvard subject headings:
Aquatic ecology--United States.
Wetland ecology--United States.
Wetlands--United States--Classification.
Princeton subject headings:
Aquatic ecology--United States.
Wetland ecology--United States.
Wetlands--United States--Classification.