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).
Rhan oPapurau D. Tecwyn Lloyd,
Llythyrau, [1956]-[1970]. Ymhllith y gohebwyr mae Tom [Parry] (6), T. H. P[arry]-W[illiams] (13), W. W. Price (2), Gwynedd O. Pierce, Iorwerth [Peate] (5), Caradog [Prichard], Eigra Lewis Roberts (7), Melville Richards, Kate Roberts (2), John Rowlands, Edward [Ned Thomas] (4), Gwyn [Thomas] (4), G[ruffydd] Aled Williams, D. J. [Williams] (13), J. E. Caerwyn Williams (4), Glanmor Williams (4), Waldo [Williams], a Jac L. Williams.
Parry, Thomas, 1904-1985