Cymdeithas yr Iaith Gymraeg/Welsh Language Society Ychwanegu i'r clipfwrdd C2/8 Ffeil 1980-1998 Rhan oWelsh Political Ephemera Collection, Cymdeithas yr Iaith Gymraeg
Cymdeithas yr Iaith Gymraeg/Welsh Language Society Ychwanegu i'r clipfwrdd C2/9 Ffeil 1993-2003 Rhan oWelsh Political Ephemera Collection, Cymdeithas yr Iaith Gymraeg
Miscellaneous groups to promote the Welsh language Ychwanegu i'r clipfwrdd C2/6 Ffeil 1979-1990 Rhan oWelsh Political Ephemera Collection,
Welsh box on 2001 Census Form Ychwanegu i'r clipfwrdd C3/31 Ffeil 2001 Rhan oWelsh Political Ephemera Collection,
