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- 11967-1998 /Ref:GB 210 CYMAEGLocation:National Library of Wales / Llyfrgell Genedlaethol CymruName of creator:Cymdeithas yr Iaith Gymraeg.Extent:2.762 metrau ciwbig (113 bocs)Language:Welsh English Cymraeg, SaesnegShow on map
- 21974-1980 /Ref:GB 210 CYMAMSLocation:National Library of Wales / Llyfrgell Genedlaethol CymruName of creator:Williams Rhodri.Extent:0.058 metrau ciwbig (2 focs)Language:CymraegShow on map
- 31962-1971 /Ref:GB 210 DRJIESLocation:National Library of Wales / Llyfrgell Genedlaethol CymruName of creator:Davies John 1938-.Extent:0.045 metrau ciwbig (5 bocs)Language:CymraegShow on map
- 41964-1969 /Ref:GB 210 CYMIONLocation:National Library of Wales / Llyfrgell Genedlaethol CymruName of creator:Cymdeithas yr Iaith Gymraeg Rhanbarth Ceredigion.Extent:0.003 metrau ciwbig (1 ffolder); 2 focs bychan (Mawrth 2009)Language:CymraegShow on map
- 51972-1979 /Ref:GB 210 CYMCASLocation:National Library of Wales / Llyfrgell Genedlaethol CymruName of creator:Cymdeithas yr Iaith Gymraeg Cell Casnewydd.Extent:2 ffolderLanguage:CymraegShow on map