Ymhlith y gohebwyr amlycaf mae R. Williams Parry (65, gan gynnwys teipysgrif o'r soned 'Y Dieithryn (John Saunders Lewis)', ac un cerdyn post, 1951, at Saunders Lewis), Syr Thomas Parry (25), Syr T.H. Parry-Williams (7), Ffransis G. Payne (20), Iorwerth C. Peate (17), a W. W. Price (7, un at R. T. Jenkins).
Part of Papurau D. Tecwyn Lloyd,
Ymhlith y gohebwyr mae Harri Webb (1); D. J. Williams (3); Glanmor Williams (1); J. E. Caerwyn Williams (3); R. Bryn Williams (3); a T. H. Parry-Williams (12).
Webb, Harri, 1920-
Llythyrau, [1915]-[1968]. Ymhlith y gohebwyr mae Morris [T.] Williams (1), [R.] Bryn [Williams] (1), Stephen [J. Williams] (5) a T. H. Parry-Williams (36).
Williams, Morris T. (Morris Thomas), 1900-1946.