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  1. Forest rangers' catechism : questions and answers on the national forests of the California region /
    By: Ayres, Robert W. - Hutchinson, Wallace I.
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1931.
    Contributed by: U.S. Department of Agriculture, National Agricultural Library
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  2. The national forests of California /
    By: Ayres, Robert W.
    Publication info: Washington, D.C. :U.S. G.P.O.,1927.
    Contributed by: U.S. Department of Agriculture, National Agricultural Library
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