Disgrifiad
Permatrace of Taff Merthyr Colliery with indentification of principle surface features and schematic of underground features showing typical method of Longwall coal working. As published on p. 11 of Collieries of Wales: Engineering and Architecture by S. Hughes et al
Cofnod Casglu
CWC - RCAHMW Collieries Publication Collection
Cychwynnwr
Stephen R. Hughes, RCAHMW
