United States. Department of Agriculture. Office of the Secretary. (1927). Relations between crop yields and precipitation in Great Plains area. U.S. GPO.
Chicago Style (17th ed.) CitationUnited States. Department of Agriculture. Office of the Secretary. Relations Between Crop Yields and Precipitation in Great Plains Area. Washington: U.S. GPO, 1927.
MLA (9th ed.) CitationUnited States. Department of Agriculture. Office of the Secretary. Relations Between Crop Yields and Precipitation in Great Plains Area. U.S. GPO, 1927.
Warning: These citations may not always be 100% accurate.