Pearl, R. M. (1951). Guide to geologic literature. McGraw-Hill.
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Dyfyniad Arddull Chicago
Pearl, Richard Maxwell. Guide to Geologic Literature. New York [usw.]: McGraw-Hill, 1951.
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Dyfyniad MLA
Pearl, Richard Maxwell. Guide to Geologic Literature. McGraw-Hill, 1951.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.