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Porphyry Databases
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ElectronicResource GovDoc
Singer, D. A.
Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2008.
2008
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ElectronicResource GovDoc
Singer, D. A.
Menlo Park, Calif. : U.S. Dept. of the Interior, U.S. Geological Survey, 2005.
2005
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