Columbia subject headings:
Great Lakes (North America)--Congresses.
Harvard subject headings:
Air--Pollution--Great Lakes (North America)--Congresses.
Environmental impact statements--Great Lakes (North America)
Great Lakes (North America)--Congresses.
Pollution--Great Lakes (North America)
Radioactive pollution of the atmosphere--Great Lakes (North America)
Radioactive substances in rivers, lakes, etc.--Congresses.
Water--Pollution--Great Lakes (North America)--Congresses.
Princeton subject headings: