(1977). National geographic index: 1947-1976 (inclusive) (ed.). National geographic society.
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Dyfyniad Arddull Chicago
National Geographic Index: 1947-1976 (inclusive). ed. Washington,D.C.: National geographic society, 1977.
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Dyfyniad MLA
National Geographic Index: 1947-1976 (inclusive). ed. National geographic society, 1977.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.