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| Title | OFD Ogof Ffynnon Ddu - S1073 - Plan |
| Author | Railton,C.L |
| Date | 1953 |
| Subject | OFD Ogof Ffynnon Ddu |
| Notes | Historical Survey - Likely earlier version of S1072 |
| Language | English |
| Number | S1073 |
| Type | Survey |