- P4/2/5.
- File
- 1882-1892.
Part of Monmouthshire and South Wales Coal Owners Association Records,
Letters and papers relating to the disputes at Mardy; Rhymney; Nixons Navigation Collieries, Mountain Ash (1885) and Dwrllas (1882). Also the Albion Colliery, Neath Merthyr Colliery, and Cwmaman Colliery.