J. Conway Davies Papers,
J. Conway Davies Papers,
J. D. Innes
J. D. Innes
J. D. Jones Manuscripts
J. D. Jones Manuscripts
J. D. Jones, Ruthin Papers
J. D. Jones, Ruthin Papers
J. D. K. Lloyd papers
J. D. K. Lloyd papers
J. D. Lewis and Sons, Llandysul, correspondence,
J. D. Lewis and Sons, Llandysul, correspondence,
J. D. Lloyd and Sons Records,
J. D. Lloyd and Sons Records,
J. D. Richards Manuscripts,
J. D. Richards Manuscripts,
J. D. Williams papers.
J. D. Williams papers.
J. Dyfnallt Owen papers relating to Brittany
J. Dyfnallt Owen papers relating to Brittany
J. E. Caerwyn Williams: Papurau Y Traethodydd, &c.
J. E. Caerwyn Williams: Papurau Y Traethodydd, &c.
J. E. Griffith Manuscripts
J. E. Griffith Manuscripts
J. E. Powell Papers
J. E. Powell Papers
J. E. Thomas: The Highest Interests of Wales
J. E. Thomas: The Highest Interests of Wales
J. F. Smith Collection of Flintshire and Denbighshire Deeds,
J. F. Smith Collection of Flintshire and Denbighshire Deeds,
J. Fielding: Notes on Rhyl
J. Fielding: Notes on Rhyl
J. G. Caulett: Notes on pharmacopoeia
J. G. Caulett: Notes on pharmacopoeia
J. Glyn Davies Papers,
J. Glyn Davies Papers,
J. Glyn Picton Papers,
J. Glyn Picton Papers,
J. Glyndyrus Williams Music MSS,
J. Glyndyrus Williams Music MSS,
