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Dyfyniad APA
Paige Sidney. (19). Geologic atlas of the United States. s.n.
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Dyfyniad Arddull Chicago
Paige Sidney. Geologic Atlas of the United States. s.n, 19.
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Dyfyniad MLA
Paige Sidney. Geologic Atlas of the United States. s.n, 19.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.