United States. Bureau of Chemistry and Soils, University of Arizona. Agricultural Experiment Station, & Harper, W. G. (1931). Soil survey of the Salt River Valley area, Arizona. United States Dept. of Agriculture, Bureau of Chemistry and Soils.
Chicago Style (17th ed.) CitationUnited States. Bureau of Chemistry and Soils, University of Arizona. Agricultural Experiment Station, and W. G. Harper. Soil Survey of the Salt River Valley Area, Arizona. Washington, D.C.: United States Dept. of Agriculture, Bureau of Chemistry and Soils, 1931.
MLA (9th ed.) CitationUnited States. Bureau of Chemistry and Soils, et al. Soil Survey of the Salt River Valley Area, Arizona. United States Dept. of Agriculture, Bureau of Chemistry and Soils, 1931.
Warning: These citations may not always be 100% accurate.