'Madoc: An Essay on the Discovery of America ...'
- NLW MS 963C
- Ffeil
- 1859-1868
Letters, 1859-1868, to Stephens mainly relating to the supposed discovery of America by Madog ab Owain Gwynedd and the possibility of the existence of a tribe of Welsh Indians ('y Madogwys'); miscellaneous notes; and press cuttings.