No. 1 Area Correlation of the Swansea Six Feet and Graigola Seams Pontardulais and Gorseinon District. To Accompany Diagrams 1657 and 1658. With annotation on the cover: Graig Merthyr Mar 1950
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- ReferenceGB 216 D/D PRO/NCB/6/55
- Dates of CreationMar 1950
- Language of MaterialEnglish
- Physical Description1 file