Merkoša sitáhtat
APA-čujuhus (7. p.)
Estados Unidos Department of Agriculture Forest Service. (1948). Forest regions of the United States. U.S. Department of Agricultura.
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Chicago-čujuhus (17. p.)
Estados Unidos Department of Agriculture Forest Service. Forest Regions of the United States. U.S. Department of Agricultura, 1948.
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MLA-čujuhus (9. p.)
Estados Unidos Department of Agriculture Forest Service. Forest Regions of the United States. U.S. Department of Agricultura, 1948.
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