Geological Survey (U.S.) & Sacks, P. E. (1996). Geologic map of the Valentines 7.5-minute quadrangle, Brunswick and Greensville counties, Virginia, and Northampton and Halifax counties, North Carolina. The Survey.
Chicago Style (17th ed.) CitationGeological Survey (U.S.) and Paul E. Sacks. Geologic Map of the Valentines 7.5-minute Quadrangle, Brunswick and Greensville Counties, Virginia, and Northampton and Halifax Counties, North Carolina. Reston, VA: The Survey, 1996.
MLA (9th ed.) CitationGeological Survey (U.S.) and Paul E. Sacks. Geologic Map of the Valentines 7.5-minute Quadrangle, Brunswick and Greensville Counties, Virginia, and Northampton and Halifax Counties, North Carolina. The Survey, 1996.
Warning: These citations may not always be 100% accurate.