APA (7th ed.) Citation

Nickelsen, R. P. (1956). Geologic map and sections of northwestern Loudoun County, Virginia. Geological Society of America.

Chicago Style (17th ed.) Citation

Nickelsen, Richard P. Geologic Map and Sections of Northwestern Loudoun County, Virginia. New York: Geological Society of America, 1956.

MLA (9th ed.) Citation

Nickelsen, Richard P. Geologic Map and Sections of Northwestern Loudoun County, Virginia. Geological Society of America, 1956.