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Maryland Department of Geology, Mines, and Water Resources, scale 1:62,500
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The ages of rocks and minerals
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Metamorphism in the Potomac composite terrane, Virginia-Maryland
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The Dalecarlia Inrusive Suite and Clarendon Granite in the Potomac Valley
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84871762456
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U.S. Geological Survey Professional Paper 1205
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The Piney Branch Complex-A metamorphosed fragment of the central Appalachian ophiolite in northern Virginia
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