Reports and maps of the Geological Survey released only in the open files, 1971
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Geology topics
George W. Brett
Publications and source records attributed to George W. Brett.
Reports and maps of the Geological Survey released only in the open files, 1968
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Reports and maps of the Geological Survey released only in the open files, 1967
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Reports and maps of the Geological Survey released only in the open files, 1966
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Reports and maps of the Geological Survey released only in the open files, 1963
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