Letters to 'Erfyl', the correspondents including [John Blackwell, 'Alun'], ?1829 (references to the Royal Denbigh Eisteddfod of 1828, William Owen-Pughe, etc.); Jane Davies, Penmaen Dovey, 1851 (letters of her father, 'Gwallter Mechain'); [Robert Davies, 'Bardd Nantglyn'], 1818; Evan Evans ('Ieuan Glan Geirionydd'), 1847-54 (Rhuddlan Eisteddfod, 1850, etc.); [John Jones, 'Ioan Tegid'], Christ Church, Oxford, 1840; [John Jones[ 'Myllin', 1820 (emigrants from Llanfyllin, Llangadfan, Hirnant, and Llangynog, to America, Wrexham Eisteddfod, 1820, 'Dafydd Ddu Eryri' and 'Dafydd Ionawr'); John Owen ('Owan Alaw')  (death of 'Ieuan Glan Geirionydd'); W[illiam] Owen-Pughe, 1834; W[illiam] Rowlands ('Gwilym Lleyn'); Robert Saunderson, Bala, 1830-48; Morris Williams ('Nicander'), Jesus College [Oxford], 1832-?34 (orthography of the Welsh Bible); and William Williams ('Gwilym Caledfryn'), 1824-5 (a bitter attack on David Saunders, Merthyr, etc.). NLW MS 9031 also contains letters to John Parry, Chester from W[illiam] E[dwards], Ysgeifiog, 1823, and Evan Evans ('Ieuan Glan Geirionydd'), 1820, and from [Thomas Price, 'Carnhuanawc'] to Y Gwladgarwr (printed in the 1834 edition, pp. 19-20); and letters from 'Erfyl' to W[alter] D[avies] ('Gwallter Mechain'), 1818 and undated (Welsh proverbs, Welsh grammar), R[obert] D[avies] ('Bardd Nantglyn'), 1818 (Welsh poetry), [John Jones, 'Myllin', 1838], 'Ioan Tegid', 1831 (orthography of the Welsh Bible), R[ichard] P[arry, 'Gwalchmai'], 1850 and undated (references to Richard Llwyd ('Bard of Snowdon') and the Rhuddlan Eisteddfod of 1850), [Robert] S[aunderson, Bala], 1850 and undated, and others.