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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ayres, Robert W. (Robert William),
    Publication info: Washington, D.C, U.S. G.P.O, 1927
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Ayres, Robert W. (Robert William), - Hutchinson, Wallace I. (Wallace Irving),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1931
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Ayres, Robert W. (Robert William), - United States. Forest Service.
    Publication info: [Washington], Forest Service, U.S. Dept. of Agriculture, 1958
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library