CWMDU AIR SHAFT COLLAPSED WORKINGS
UNDERHILL WOOD EARLY COAL WORKINGS, JEFFREYSTON
WINCHESTOWN MINE WORKINGS
FFOS-Y-FRAN (MERTHYR SE)
MERTHYR COMMON COAL WORKINGS
JEFFREYSTONE, COAL WORKINGS SE OF
PEN-FFORDD-GOCH IRON AND COAL WORKINGS, BLAENAVON
FOEL-Y-DYFFRYN, MINE WORKINGS