Letters addressed to William Oliver,
- NLW MS 9120B.
- Ffeil
- 1868-1904.
Letters addressed to William Oliver by John Ballinger, 1902, O. M. Edwards, 1902, E. Vincent Evans, 1903-1904, W. B. Gurdon, 1869, Henry Morley, 1887, Thomas Nelson and Sons, 1903, Alfred Nutt, 1901, Alfred Neobard Palmer, 1903, John Ruskin, 1868, T. F. Tout, and Josiah Thomas, Liverpool (the ownership of Y Tyst).