Datblygu deunydd [asesu] yn yr iaith Gymraeg. Arolwg siarad Cymraeg 1985 ymhlith disgyblion 10-11 oed, iaith gyntaf ac ail iaith

Original title:  Datblygu deunydd [asesu] yn yr iaith Gymraeg. Arolwg siarad Cymraeg 1985 ymhlith disgyblion 10-11 oed, iaith gyntaf ac ail iaith
Original language:  Welsh

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