Aberpergwm Colliery. Eighteen Feet Seam, No 7 Main Heading and No. A6 Main Heading, 8th and 9th October 1969 (1399/70/WW) May 1970
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- ReferenceGB 216 D/D PRO/NCB/6/1486
- Dates of CreationMay 1970
- Language of MaterialEnglish
- Physical Description1 file