Lowenthal, D. (2003). George Perkins Marsh: Prophet of conservation. University of Washington Press.
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Chicago-čujuhus (17. p.)
Lowenthal, David. George Perkins Marsh: Prophet of Conservation. Seattle, WA: University of Washington Press, 2003.
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MLA-čujuhus (9. p.)
Lowenthal, David. George Perkins Marsh: Prophet of Conservation. University of Washington Press, 2003.
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