Columbia subject headings:
Factory and trade waste--Law and legislation--Minnesota.
Factory and trade waste--Law and legislation--United States.
Iron mines and mining--Environmental aspects--Minnesota.
Reserve Mining Company.
Taconite--Environmental aspects--Minnesota.
Taconite--Environmental aspects--Superior, Lake.
Water--Pollution--Superior, Lake.
Harvard subject headings:
Factory and trade waste--Law and legislation--Minnesota.
Factory and trade waste--Law and legislation--United States.
Iron mines and mining--Environmental aspects--Minnesota.
Reserve Mining Company.
Taconite--Environmental aspects--Minnesota.
Taconite--Environmental aspects--Superior, Lake.
Water--Pollution--Superior, Lake.
Princeton subject headings:
Factory and trade waste--Law and legislation--Minnesota.
Factory and trade waste--Law and legislation--United States.
Iron mines and mining--Environmental aspects--Minnesota.
Reserve Mining Company.
Taconite--Environmental aspects--Minnesota.
Taconite--Environmental aspects--Superior, Lake.
Water--Pollution--Superior, Lake.