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Dyfyniad APA
Ribeiro Maria Luísa. (2011). Carta geológica de Portugal na escala de 1: 50 000. LNEG.
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Dyfyniad Arddull Chicago
Ribeiro Maria Luísa. Carta Geológica De Portugal Na Escala De 1: 50 000. LNEG, 2011.
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Dyfyniad MLA
Ribeiro Maria Luísa. Carta Geológica De Portugal Na Escala De 1: 50 000. LNEG, 2011.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.