Examples of sonography and printing account,
- NLW MS 4612B.
- Ffeil
- [1875x1887] /
Rhan oD. S. Davies MSS,
Examples of sonography, the system of short-hand devised by D. S. Davies, with an account from William James Morgan, Carmarthen for printing D. S. Davies: Manual of Sonography ... (London, 1887).
D. S. Davies and William James Morgan.