Shimomura,Ruth H. (1989). GeoRef thesaurus and guide to indexing (5th ed.). American geological institute.
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Dyfyniad Arddull Chicago
Shimomura,Ruth H. GeoRef Thesaurus and Guide to Indexing. 5th ed. Alexandria, Virginia: American geological institute, 1989.
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Dyfyniad MLA
Shimomura,Ruth H. GeoRef Thesaurus and Guide to Indexing. 5th ed. American geological institute, 1989.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.