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Dyfyniad APA
Leverett Frank. (1929). Map of the surficial deposits of the lake superior region. U. S. Geological Survey.
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Dyfyniad Arddull Chicago
Leverett Frank. Map of the Surficial Deposits of the Lake Superior Region. U. S. Geological Survey, 1929.
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Dyfyniad MLA
Leverett Frank. Map of the Surficial Deposits of the Lake Superior Region. U. S. Geological Survey, 1929.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.