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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
- 21919-1984.Ref:GB 210 NLW MS 22725ELocation:National Library of Wales / Llyfrgell Genedlaethol CymruExtent:i, 248 ff. Guarded and filedLanguage:Welsh, EnglishShow on map
- 31976Ref:GB 210 LW14/2/6Location:National Library of Wales / Llyfrgell Genedlaethol CymruExtent:Envelope, 9 itemsShow on map
- 41992-2002.Ref:GB 210 D/13Location:National Library of Wales / Llyfrgell Genedlaethol CymruExtent:1.25 cmShow on map
- 52007.Ref:GB 210 NLW ex 2501Location:National Library of Wales / Llyfrgell Genedlaethol CymruName of creator:Cymdeithas yr Iaith Gymraeg.Extent:2 eitem mewn waledShow on map
- 61996-1998Ref:GB 210 DLocation:National Library of Wales / Llyfrgell Genedlaethol CymruExtent:1 ffolderShow on map
- 71988-1993Ref:GB 210 CC4Location:National Library of Wales / Llyfrgell Genedlaethol CymruExtent:3 foldersLanguage:Welsh, EnglishShow on map
- 81988-2007Ref:GB 210 4Location:National Library of Wales / Llyfrgell Genedlaethol CymruExtent:8 bocs ffeilShow on map
- 91984-2001Ref:GB 210 1Location:National Library of Wales / Llyfrgell Genedlaethol CymruExtent:20 bocs ffeilShow on map
- 101988-1999Ref:GB 210 2Location:National Library of Wales / Llyfrgell Genedlaethol CymruExtent:4 bocs ffeilShow on map
- 111995-1999Ref:GB 210 3Location:National Library of Wales / Llyfrgell Genedlaethol CymruExtent:2 bocs ffeilShow on map
- 12[1968]-[1971].Ref:GB 210 NLW ex 2826Location:National Library of Wales / Llyfrgell Genedlaethol CymruExtent:1 boxLanguage:English Welsh English, WelshShow on map
- 131979-1983Ref:GB 210 ALocation:National Library of Wales / Llyfrgell Genedlaethol CymruExtent:1 ffolderShow on map
- 141967-1989.Ref:GB 210 8/2Location:National Library of Wales / Llyfrgell Genedlaethol CymruExtent:1 cmLanguage:Includes several items in Welsh, and one item in GermanShow on map
- 151974-1980 /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
- 161984-2007Ref:GB 210 CYMIAITHMORGWELocation:National Library of Wales / Llyfrgell Genedlaethol CymruName of creator:Cymdeithas yr Iaith Gymraeg Rhanbarth Morgannwg Gwent.Extent:0.306 metrau ciwbig (34 ffeil)Language:Welsh English Cymraeg a SaesnegShow on map
- 171962-1971 /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
- 181964-1969 /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
- 191972-1979 /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
- 201950 July 20 - 1965 December 15Ref:GB 222 BMSS MATHLocation:Archifdy Prifysgol Bangor / Bangor University ArchivesName of creator:Hughes Mathonwy.Extent:4 itemsLanguage:WelshShow on map