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  1. Forest protection,
    By: Pennsylvania.
    Publication info: [Harrisburg, Pa.]1922.
    Contributed by: Library of Congress
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  2. Propagation of forest trees having commercial value and adapted to Pennsylvania.
    By: Pennsylvania. - Wirt, George H.
    Publication info: [Harrisburg]W. S. Ray, state printer,1902.
    Contributed by: Library of Congress
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  3. State forest academy.
    By: Pennsylvania.
    Publication info: Harrisburg, Penna.,J. L. L. Kuhn, printer to the commonwealth,1918.
    Contributed by: Library of Congress
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