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About the geologic map in the National Atlas of the United States of America
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Ancient lavas in Shenandoah National Park near Luray, Virginia
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Crystalline rocks of the Potomac River Gorge near Washington, D.C
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Geology of the Linville Falls Quadrangle, North Carolina
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Geology of the Mount McKinley quadrangle, Alaska
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Gold veins near Great Falls, Maryland
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The North America tapestry of time and terrain
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The river and the rocks
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