Milwr Tunnel: geological plan of tunnel and lodes from north of Pen-y-Bryn Shaft to south-east of 561/563.
Scale: 1 inch to 100 feet.
152 cm x 570 cm.
E9/1.
Milwr Tunnel: geological plan of tunnel and lodes from north of Pen-y-Bryn Shaft to south-east of 561/563.
Scale: 1 inch to 100 feet.
152 cm x 570 cm.
E9/1.
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