Columbia subject headings:
Wetland ecology--Great Lakes Region (North America)--Congresses.
Wetlands--Great Lakes Region (North America)--Congresses.
Harvard subject headings:
Wetland ecology--Great Lakes Region (North America)--Congresses.
Wetland ecology--Great Lakes Region--Congresses.
Wetlands--Great Lakes Region (North America)--Congresses.
Wetlands--Great Lakes Region--Congresses.
Princeton subject headings: