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  1. By: Salisbury, Morse, - Knight, Henry G., - National Broadcasting Company. - United States. Bureau of Chemistry and Soils.
    Publication info: [United States] :[Department of Agriculture],August 31, 1932.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Knight, Henry G., - National Broadcasting Company. - United States. Bureau of Chemistry and Soils.
    Publication info: [United States] :[Department of Agriculture],January 6, 1933.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Van Dersal, William Richard, - Mulford, Furman Lloyd, - Thornthwaite, C. w. (Charles Warren), - United States. Bureau of Chemistry and Soils.
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1938.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Thom, Charles, - National Broadcasting Company. - United States. Bureau of Chemistry and Soils.
    Publication info: [United States] :[Department of Agriculture],January 19, 1931.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library