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  1. By: United States. Forest Service. - O'brien, Patrick J.
    Edition: Revised 1934.
    Publication info: Washington, U.S. Government Printing Office, 1935
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: United States. Forest Service. - O'brien, Patrick J.
    Publication info: Washington, Govt. print. off, 1922
    Holding Institution: Library of Congress
  3. By: United States. Forest Service. - O'brien, Patrick J.
    Publication info: Washington, Govt. print. off, 1922
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library