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1
Prospects for mineral resource assessments on public lands : proceedings of the Leesburg workshop /
Denver, CO : Dept. of the Interior, U.S. Geological Survey : Books and Open-File Reports Section, U.S. Geological Survey [distributor], 1986

Government Document Book
2
Acid rain and friendly neighbors : the policy dispute between Canada and the United States /
[Durham] : Duke University Press, 1988
Rev. ed.

Book
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