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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Johnson, Ernest W.,
    Edition: Slightly rev. October 1964.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1964
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: United States. Southern Great Plains Field Station, Woodward, Okla. - Johnson, Ernest W.,
    Publication info: Woodward, [1949?]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library