Correspondence, plans, drafts, notes, photographs, accounts, bills, receipts, leaflets and circulars (including orders of service, tributes to the subjects of memorials, and details of memorial funds), press cuttings and publications, 1931-1979, relating to projects that R. L. Gapper was invited to submit designs for, typically comprising gravestones and other memorials, most of which he was commissioned to undertake.

Llythyrau cyffredinol a anfonwyd at Miss Blodwen Hughes, 1939-1960, gyda R. Williams Parry ymhlith y gohebwyr,1950; llythyrau at Blodwen Hughes yn ymwneud â gweinyddu'r Gronfa Goffa, 1960-1977; llythyrau,1965-1977, oddi wrth Fanc Lloyds; cofnodion a phapurau eraill yn ymwneud â'r Pwyllgor Coffa, 1959-1977, a'r Gronfa Goffa,1960-1965; cyfrifon a chofnodion cyllidol eraill,1960-1980; rhestr tanysgrifwyr, 1960-1980; a thorion papur newydd = General letters to Miss Blodwen Hughes, 1939-1960, the correspondents including R. Williams Parry, 1950; letters to Blodwen Hughes relating to the administration of the Memorial Fund, 1960-1977; letters, 1965-1977, from Lloyds Bank; minutes and other papers relating to the Memorial Committee, 1959-1977, and the Memorial Fund, 1960-1965; accounts and other financial records, 1960-1980; lists of subscribers, 1960-1980; and newspaper cuttings.

Papurau'n ymwneud â chynllunio ac adeiladu Cofeb Hywel Dda a'r ganolfan ddeongliadol, yn cynnwys gohebiaeth, 1982-1990; papurau cyffredinol, 1982-1990; testunau teipysgrif wedi eu dethol o'r Cyfreithiau, [1983]; papurau ariannol yn ymwneud â defnyddiau adeiladu, 1983-1990; cynlluniau ar gyfer y ganolfan ddeongliadol, 1984; deunydd cyhoeddusrwydd, 1984-1985; torion papur newydd, 1982-1990; gwaith celf, [1983]-[1984]; a chofnodion, cyfrifon a phapurau eraill yn ymwneud â Chymdeithas Genedlaethol Cofeb Hywel Dda. = Papers relating to the design and construction of the Hywel Dda Memorial and interpretive centre including correspondence, 1982-1990; general papers, 1982-1990; typescript texts selected from the Laws, [1983]; financial papers relating to construction materials, 1983-1990; plan for the interpretive centre, 1984; publicity material, 1984-1985; newspaper cuttings, 1982-1990; artwork, [1983]-[1984]; and minutes, accounts and other papers relating to Cymdeithas Genedlaethol Hywel Dda, 1982-1987.