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Titles
Subjects
Conservation of natural resources - Great Lakes Region.
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Titles
The ecosystem approach : = scope and implications of an ecosystem approach to transboundary problems in the Great Lakes basin : special report to the International Joint Commission, presented July 1978 /
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(Language materials, printed)
Subjects
Conservation of natural resources- Great Lakes Region.
Ecology- Great Lakes Region.
Ecology- Research- Great Lakes Region.
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