Cite
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MLA (8th Edition)

Quaternary Geologic Map of the Blue Ridge 4° x 6° Quadrangle, United States. U.S. Geological Survey, For sale by Map Distribution, 1991.

APA (7th Edition)

Quaternary geologic map of the Blue Ridge 4° x 6° quadrangle, United States. (1991). U.S. Geological Survey, For sale by Map Distribution.

Chicago (17th Edition)

“Quaternary Geologic Map of the Blue Ridge 4° x 6° Quadrangle, United States.” Reston, Va.: U.S. Geological Survey, For sale by Map Distribution, 1991.