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  1. 1

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

    Publicado em 1975
    Livro

    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 por Hays, Samuel P.

    Publicado em 1959
    Livro

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

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