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Ychwanegiadau.

PDAG 870-871.
Series

Part of Archifau Pwyllgor Datblygu Addysg Gymraeg,

Arddangosfeydd.

PDAG 189-190.
Series

Part of Archifau Pwyllgor Datblygu Addysg Gymraeg,

Arolwg Ieithyddol Blynyddol.

PDAG 195.
Series

Part of Archifau Pwyllgor Datblygu Addysg Gymraeg,

Athrawon Bro.

PDAG 204.
Series

Part of Archifau Pwyllgor Datblygu Addysg Gymraeg,

Bas Data ac Offer Cyfieithu.

PDAG 206.
Series

Part of Archifau Pwyllgor Datblygu Addysg Gymraeg,

Cwlwm Busnes.

PDAG 361.
Series

Part of Archifau Pwyllgor Datblygu Addysg Gymraeg,

Cymdeithas yr Iaith Gymraeg.

PDAG 440-444.
Series

Part of Archifau Pwyllgor Datblygu Addysg Gymraeg,

Cynlluniau PDAG.

PDAG 554-558.
Series

Part of Archifau Pwyllgor Datblygu Addysg Gymraeg,

Cynlluniau Ymchwil.

PDAG 559.
Series

Part of Archifau Pwyllgor Datblygu Addysg Gymraeg,

DABI (Prosiect Datblygu Dwyieithrwydd mewn Addysg Bellach Is) gweler hefyd Cyllid (PDAG 438-9), Cynadleddau (PDAG 457) a Dwyieithrwydd mewn Addysg ....

PDAG 572-573.
Series

Part of Archifau Pwyllgor Datblygu Addysg Gymraeg,

DABI (Prosiect Datblygu Dwyieithrwydd mewn Addysg Bellach Is) gweler hefyd Cyllid (PDAG 438-9), Cynadleddau (PDAG 457) a Dwyieithrwydd mewn Addysg Bellach.

Eisteddfodau.