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2000 resource assessment of selected coal beds and zones in the Northern and Central Appalachian Basin coal regions

Published: [Reston, VA] : U.S. Geological Survey, 2001
Format: Electronic Resource, Optical disc
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The effect of selected cleaning techniques on Berkshire Lee marble a scientific study at Philadelphia City Hall

Published: [Menlo Park, Calif.] : U.S. Geological Survey, 2001
Format: Electronic Resource, Optical disc
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