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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Birkhead, James W. (James Wesley), - United States. Bureau of Agricultural Economics.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, Bureau of Agricultural Economics, 1950
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Davis, Albert Bartlett, - Birkhead, James W. (James Wesley),
    Publication info: [Washington, D.C.], U.S. Dept. of Agriculture, Foreign Agricultural Service, 1965
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library