Section (No. 4) of Holywell Mines, Gyrnfawr Vein.
Scale: 1 inch to 8 fathoms.
94cm x 29cm.
Section (No. 4) of Holywell Mines, Gyrnfawr Vein.
Scale: 1 inch to 8 fathoms.
94cm x 29cm.
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