| Subject | Strikes and lockouts--Coal mining--Wales, South; Coal miners--Trades unions--Wales, South; Trades unions--Records and correspondence; Trades union branches--Wales, South; Workers' compensation claims--Wales, South; Trades unions--Accounting; Industrial accidents--Reporting--Wales, South; Corporate minutes--Wales, South; Compensation management--Wales, South; Strikes and lockouts--Coal mining--Wales, South; Strikes and lockouts--Coal mining--Wales, South; |