检索结果 - Hays, Samuel P.

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    Wars in the woods : the rise of ecological forestry in America / 由 Hays, Samuel P.

    出版 2007
    An electronic book accessible through the World Wide Web; click to view
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  2. 2
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    The American people & the national forests : the first century of the U.S. Forest Service / 由 Hays, Samuel P.

    出版 2009
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    Conservation and the gospel of efficiency : the progressive conservation movement, 1890-1920 / 由 Hays, Samuel P.

    出版 1999
    An electronic book accessible through the World Wide Web; click to view
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