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Devonian rocks and Lower and Middle Devonian pelecypods of Guangxi, China, and the Traverse Group of Michigan /
Washington : Denver, CO : U.S. G.P.O. ; For sale by the Book and Open-File Reports Section, U.S. Geological Survey, 1986

Government Document Book
2
Geology and hydrology for environmental planning in Washtenaw County, Michigan /
by Fleck, William B.
Lansing, Mich. : Dept. of the Interior, Geological Survey, 1980

Government Document Book
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