Backes, D. (1997). A wilderness within: The life of Sigurd F. Olson. University of Minnesota Press.
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Chicago-čujuhus (17. p.)
Backes, David. A Wilderness Within: The Life of Sigurd F. Olson. Minneapolis: University of Minnesota Press, 1997.
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MLA-čujuhus (9. p.)
Backes, David. A Wilderness Within: The Life of Sigurd F. Olson. University of Minnesota Press, 1997.
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