Cofnodi Dyfyniadau
Dyfyniad APA
Jack John G. (1898). Pikes peak, plum creek and South platte. U. S. Geological Survey.
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Dyfyniad Arddull Chicago
Jack John G. Pikes Peak, Plum Creek and South Platte. U. S. Geological Survey, 1898.
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Dyfyniad MLA
Jack John G. Pikes Peak, Plum Creek and South Platte. U. S. Geological Survey, 1898.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.