United States. Soil Conservation Service & Virginia Polytechnic Institute and State University. (1989). Soil survey of Northampton County, Virginia. The Service.
Chicago Style (17th ed.) CitationUnited States. Soil Conservation Service and Virginia Polytechnic Institute and State University. Soil Survey of Northampton County, Virginia. [Washington, D.C.?]: The Service, 1989.
MLA (8th ed.) CitationUnited States. Soil Conservation Service and Virginia Polytechnic Institute and State University. Soil Survey of Northampton County, Virginia. The Service, 1989.
Warning: These citations may not always be 100% accurate.