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Ffotogopïau o lythyrau J. W. Thomas (Arfonwyson, 1805-40) at y Seryddwr Brenhinol Syr George Airy (1801-92) yn ymwneud â'i waith yn yr Arsyllfa Frenhinol yn Greenwich, 1837-9, copi o lythyr Griffith Davies, 1836, at George Airy a gohebiaeth, 1985-6, a fu rhwng R. Elwyn Hughes a staff yr Arsyllfa wrth baratoi ei erthygl, 'Arfonwyson - uchelgais a siom' ar gyfer Cylchgrawn Llyfrgell Genedlaethol Cymru, cyfrol XXXI, 1999-2000, tt. 149-71. Cynhwysir ad-argraffiad o'r erthygl. / Photocopies of letters from J. W. Thomas (Arfonwyson, 1805-40) to the Astronomer Royal Sir George Airy (1801-92), relating to his work at the Royal Greenwich Observatory, 1837-9, a copy of Griffith Davies's letter, 1836, to George Airy, and R. Elwyn Hughes's correspondence with staff at the Observatory whilst preparing his article, 'Arfonwyson - uchelgais a siom' for the National Library of Wales Journal, vol. XXXI, 1999-2000, pp. 149-71. A reprint of the article is also included.

Llythyrau, [1965x1987], 1991, gan gynnwys rhai oddi wrth Alun J. Jones, Dafydd Jenkins, R. Elwyn Hughes, John [Stoddart], W. R. P. George, Gareth [Alban Davies], Elin ap Hywel, Gwyn Williams, Rhydwen Williams, cerdd gan Steve Eaves, ynghyd â chyfraniadau llenyddol a anfonwyd i Taliesin.