Plan of the surface at Graig Merthyr Colliery, identifying colliery buildings, scale 1:500. 22 Aug. 1961

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Plans of various collieriesD/D Z 542

Plan of the surface at Graig Merthyr Colliery, identifying colliery buildings, scale 1:500. 22 Aug. 1961D/D Z 542/1

Plan of workings at the Brynlliw/Morlais Colliery showing the Three Feet, Five Feet and Six Feet seams; scale 1:5000. n.d., ?1960sD/D Z 542/2