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  1. Guidebook for the identification of woods used for ties and timbers,
    By: Forest Products Laboratory (U.S.) - Koehler, Arthur.
    Publication info: Washington,U.S. Govt.Print.Off.,1917.
    Contributed by: U.S. Department of Agriculture, National Agricultural Library
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  2. Guidebook for the identification of woods used for ties and timbers, by Arthur Koehler, expert in wood identification, Forest products laboratory, Madison, Wisconsin.
    By: Forest Products Laboratory (U.S.) - Koehler, Arthur.
    Publication info: Washington :Govt. print. off.,1917.
    Contributed by: University of British Columbia Library (archive.org)
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