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  1. The Lewis and Clark forest reserve, Montana, by H.B. Ayres. Extract from the Twenty-first annual report of the [U.S. Geological] survey, 1899-1900 ... Part V. Forest reserves ...
    By: Ayres, H. B.
    Publication info: Washington,U.S. Govt. Print. Off.,1900.
    Contributed by: Library of Congress
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  2. Timber conditions in the pine region of Minnesota,
    By: Ayres, H. B.
    Publication info: Washington,Govt. print. off.,1900.
    Contributed by: Library of Congress
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