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Characteristics and availability of data from earth-imaging satellites
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Geologic map of Loudoun County, Virginia
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Geologic map of the Buckeystown quadrangle, Frederick and Montgomery Counties, Maryland, and Loudoun County, Virginia
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Geology of the Chesapeake and Ohio Canal National Historical Park and Potomac River corridor, District of Columbia, Maryland, West Virginia, and Virginia
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Geology of the Harpers Ferry Quadrangle, Virginia, Maryland, and West Virginia
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Geology of the National Capital Region
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