APA (7th ed.) Citation

United States. Soil Conservation Service. (1990). Soil survey of Bertie County, North Carolina. The Service.

Chicago Style (17th ed.) Citation

United States. Soil Conservation Service. Soil Survey of Bertie County, North Carolina. [Washington, D.C.?]: The Service, 1990.

MLA (9th ed.) Citation

United States. Soil Conservation Service. Soil Survey of Bertie County, North Carolina. The Service, 1990.

Warning: These citations may not always be 100% accurate.