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  1. 1

    Conservation and the gospel of efficiency the progressive conservation movement, 1890-1920 nork Hays, Samuel P.

    Argitaratua 1975
    Liburua

    Conservation and the gospel of efficiency the progressive conservation movement, 1890-1920
  2. 2

    Conservation and the gospel of efficiency the progressive conservation movement, 1890-1920 nork Hays, Samuel P.

    Argitaratua 1959
    Liburua

    Conservation and the gospel of efficiency the progressive conservation movement, 1890-1920

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