United States. Bureau of Chemistry and Soils & Lee, W. D. (1928). Soil survey, Polk County, N.C. U.S. GPO.
Chicago Style (17th ed.) CitationUnited States. Bureau of Chemistry and Soils and William D. Lee. Soil Survey, Polk County, N.C. Washington: U.S. GPO, 1928.
MLA (9th ed.) CitationUnited States. Bureau of Chemistry and Soils and William D. Lee. Soil Survey, Polk County, N.C. U.S. GPO, 1928.
Warning: These citations may not always be 100% accurate.