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- biological invasions--great lakes (north america)1
- discharge of ballast water--environmental aspects--saint lawrence seaway1
- discharge of ballast water--government policy--north america1
- muskegon river (mich.)--description and travel1
- muskegon river (mich.)--environmental conditions1
- muskegon river (mich.)--history1
- natural history--michigan--muskegon river1
- nonindigenous aquatic pests--control--great lakes (north america)1
- nonindigenous aquatic pests--great lakes (north america)1