Collection: Gwyddoniaeth a Thechnoleg

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  • Rhyfeddol! Sut i Dynnu Llun
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  • Broga Bach Heglog
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  • Nefoedd yr Adar!
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  • Mae Mwy i’r Wy
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  • Dan y Don
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  • Rhyfeddol!
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  • Tyfa, Goeden, Tyfa!
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  • Infertebratau brwd!
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  • Albert yn yr Awyr
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  • Albert Anferth
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  • Mali a’r Cyfnod Clo
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  • Yr Addewid
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  • Geiriau Diflanedig
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  • Mali a'r Morfil
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