- P4/2/4.
- File
- 1884-1896.
Part of Monmouthshire and South Wales Coal Owners Association Records,
Letters and papers relating mainly to the hauliers' disputes at the Ocean Colliery; Deep Navigation Colliery, Penrikyber, Aberdare; Merthyr and Dowlais Collieries; Cwmaman; the Rhymney Iron Company Collieries, Abercarn; Neath Merthyr; Nixon's Navigation Colliery, Mountain Ash and others.