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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)
The identification of true mahogany, certain so-called mahoganies, and some common substitutes.
By: Koehler, Arthur.
Publication info: Washington[Govt. print. off.]1922.
Contributed by: Library of Congress