Cofnodi Dyfyniadau
Dyfyniad APA
Estados Unidos Department of Agriculture Forest Service. (1948). Forest regions of the United States. U.S. Department of Agricultura.
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Dyfyniad Arddull Chicago
Estados Unidos Department of Agriculture Forest Service. Forest Regions of the United States. U.S. Department of Agricultura, 1948.
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Dyfyniad MLA
Estados Unidos Department of Agriculture Forest Service. Forest Regions of the United States. U.S. Department of Agricultura, 1948.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.