United States. Bureau of Chemistry and Soils. (1936). Development and significance of great soil groups of United States. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Bureau of Chemistry and Soils. Development and Significance of Great Soil Groups of United States. [Washington]: [s.n.], 1936.
MLA (9th ed.) CitationUnited States. Bureau of Chemistry and Soils. Development and Significance of Great Soil Groups of United States. [s.n.], 1936.
Warning: These citations may not always be 100% accurate.