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  1. By: Salisbury, Morse, - Knight, Henry Granger, - United States. Bureau of Chemistry and Soils. - National Broadcasting Company.
    Publication info: [United States], [Department of Agriculture], August 31, 1932
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Knight, Henry Granger, - United States. Bureau of Chemistry and Soils. - National Broadcasting Company.
    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, - United States. Bureau of Chemistry and Soils. - National Broadcasting Company.
    Publication info: [United States], [Department of Agriculture], January 19, 1931
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library