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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Knight, Henry Granger,
    Publication info: Easton? Pa, 1920
    Holding Institution: Library of Congress
  2. 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
  3. 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