Llythyrau amrywiol, 1934-95 a heb ddyddiad, gan gynnwys rhai oddi wrth Alun Talfan Davies, 1961-83 (146/108, 156, 196, 220, 237); Aneirin Talfan Davies, 1937-78 a heb ddyddiad (146/11, 71, 160, 191, 274-79); Cassie Davies, 1952, 1956 a heb ddyddiad (146/40, 65, 280-1); [D.] Jacob Davies, heb ddyddiad (146/282); E. Tegla Davies, 1953-63 (146/42, 55, 57-58, 68, 73, 89, 105, 119, 131); Jennie Eirian Davies, 1980 (146/208); W. Beynon Davies, 1975 (146/176); Marion Eames, 1983 (146/232); Alun R. Edwards, 1960-80 a heb ddyddiad (146/98, 165, 217, 283); Eirys Edwards, heb ddyddiad (146/334); Ifan ab Owen Edwards, 1949 a heb ddyddiad (146/29, 284); Owen Edwards, 1957, 1986 a heb ddyddiad (146/79, 263, 293); Islwyn Ffowc Elis, 1963-84 a heb ddyddiad (146/124-25, 145, 246, 285); Gwynfor Evans, 1937 a 1975 (146/12, 183); Hugh Griffith, 1943 a 1965 (146/16, 140); Kenneth Griffith, 1993 (146/269); R. E. Griffith, 1973 (146/164); Carwyn James, 1971 (146/156); William Jenkins, AS, 1937 (146/10); Bedwyr Lewis Jones, 1980 a heb ddyddiad (146/206, 346); Bobi Jones, 1957 a heb ddyddiad (146/77, 81-82, 84, 338-42); [David Jones] ('Isfoel'), 1962 (146/111); Gwilym R. Jones, 1936 (146/7); J. Henry Jones, 1956 (146/66); John [Gwilym Jones], 1963 (146/126); Kitty Idwal Jones, 1965 (146/138); yr Athro Thomas Jones, 1966 (146/141-42); Elfed [Lewis], heb ddyddiad (146/323); Saunders Lewis, 1964 (146/135); Timothy Lewis, 1957 (146/78); Bob Lloyd ('Llwyd o'r Bryn'), 1950 (146/32); Alan Llwyd, heb ddyddiad (146/286); Dyfnallt Morgan, 1960 (146/97); T. E. Nicholas, 1969 (146/150); yr Esgob George Noakes, 1983 (146/234); Dyddgu Owen, 1957-88 (146/69, 182, 195, 265); Hywel [D. Roberts], 1947, 1985 a heb ddyddiad (146/22, 250, 287); Kate Roberts, 1958-70 (146/90, 93, 117, 151-52, 154); F[rances] L. Stevenson, 1939 (146/14); D. J. [Williams], Abergwaun, 1969 (146/153); yr Esgob Gwilym [Owen Williams], 1959-60 a 1980 (146/92, 99, 219); yr Athro J. E. Caerwyn Williams, heb ddyddiad (146/322); [R.] Bryn [Williams], heb ddyddiad (146/297); T. H. Parry-Williams, 1968 a 1974 (146/146, 175); W. S. Gwynn Williams, 1945 (146/17-18); Waldo Williams, 1965 (146/139); a'r Parch. William Crwys Williams, heb ddyddiad (146/299).