Cofnodi Dyfyniadau
Dyfyniad APA
(1900). [Perfil ou corte vertical de terreno]. s.n.
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Dyfyniad Arddull Chicago
[Perfil Ou Corte Vertical De Terreno]. s.n, 1900.
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Dyfyniad MLA
[Perfil Ou Corte Vertical De Terreno]. s.n, 1900.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.