- NLW MS 9947B.
- Ffeil
- 1905-1920.
Letters addressed to John Ballinger by Max Bellows, 1916, G. Charvin, O.S.B., 1920, W. Edwards, Merthyr Tydfil, 1916, D. G. Goodwin, Uffington, 1912, John M. Macdonald, Farnham, 1916, T. H. Thomas, Cardiff, 1905, and John E. Williams, Llandaff, 1915.