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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Merz, Robert William, - Herrick, David Edwin. - Neebe, David J.
    Publication info: Columbus, Ohio, Dept. of Agriculture, Central States Forest Experiment Station, 1965
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Boyce, Stephen G. - Merz, Robert William, - Central States Forest Experiment Station (Columbus, Ohio)
    Publication info: [Columbus, Ohio], U.S. Dept. of Agriculture, Forest Service, Central States Forest Experiment Station, [1959]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library