- A4/12.
- File
- 1930.
Part of Monmouthshire and South Wales Coal Owners Association Records,
Pay tickets from Rhos and Wernos Collieries, Amalgamated Anthracite Colliery, Pentremawr, Rhymney Iron Company (Pengam), Powell Duffryn Stream Coal Co. (West Elliot), and the Ocean Coal Company (Western).