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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Spillman, W. J. (William Jasper) - Billings, George A. (George Austin) - Dixon, H. M. (Harrison Morton),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1916
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Billings, George A. (George Austin)
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1917
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library