Cotta, B. v. (1878). Die Geologie der Gegenwart.
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Dyfyniad Arddull Chicago
Cotta, Bernhard v. Die Geologie Der Gegenwart. Leipzig, 1878.
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Dyfyniad MLA
Cotta, Bernhard v. Die Geologie Der Gegenwart. 1878.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.