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2
Plankton diatom assemblages in Lake Michigan,

Government Document Book
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3
Second session of the Conference in the Matter of Pollution of the Interstate Waters of Lake Champlain and its Tributary Basin - New York - Vermont.
Published 1970

Government Document Conference Proceeding Book
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4
International Symposium on Water Pollution Control in Cold Climates : [papers] /
Published 1972

Government Document Conference Proceeding Book
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5
New Mine sealing techniques for water pollution abatement,
Published 1970

Government Document Book
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6
Clean water for the 1970's; a status report.
Published 1970

Government Document Book
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