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.
Histories of associated colliery companies,
Part of Monmouthshire and South Wales Coal Owners Association Records,
Printed material, 1935-1947, relating to the history and activities of several Monmouthshire and South Wales Coal Owners Association member companies including the Ocean Coal Company, Ltd., United National Collieries, Ltd., Powell Duffryn Associated Collieries, Ltd., Gueret, Llewellyn & Merrett, Ltd., and the Amalgamated Anthracite Collieries Ltd. Also a printed copy (bilingual) of agreed Rules and Regulations, 1849, in place at Cymmer Colliery.
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).