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Dyfyniad APA
Estados Unidos Geological Survey. (19). Manitou-Frontenac, Keweenaw, and North Cliff geologic sections. U. S. Geological Survey.
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Dyfyniad Arddull Chicago
Estados Unidos Geological Survey. Manitou-Frontenac, Keweenaw, and North Cliff Geologic Sections. U. S. Geological Survey, 19.
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Dyfyniad MLA
Estados Unidos Geological Survey. Manitou-Frontenac, Keweenaw, and North Cliff Geologic Sections. U. S. Geological Survey, 19.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.