United States. Soil Conservation Service. (1979). Major land resource areas of the United States, adjusted to county boundaries for compilations of statistical data (Rev. Apr. 12, 1978.). The Service.
Chicago Style (17th ed.) CitationUnited States. Soil Conservation Service. Major Land Resource Areas of the United States, Adjusted to County Boundaries for Compilations of Statistical Data. Rev. Apr. 12, 1978. [Hyattsville, Md.]: The Service, 1979.
MLA (9th ed.) CitationUnited States. Soil Conservation Service. Major Land Resource Areas of the United States, Adjusted to County Boundaries for Compilations of Statistical Data. Rev. Apr. 12, 1978. The Service, 1979.
Warning: These citations may not always be 100% accurate.