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by Cobb, Ernest D.
Reston, Va. : Denver, Colo. : U.S. Dept. of the Interior, Geological Survey ; Open-File Services Section, Western Distribution Branch, U.S. Geological Survey [distributor], 1985
Reston, Va. : Denver, Colo. : U.S. Dept. of the Interior, Geological Survey ; Open-File Services Section, Western Distribution Branch, U.S. Geological Survey [distributor], 1985
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