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| Title | OFD Ogof Ffynnon Ddu - S1011 - A Topographical Survey |
| Author | Haycock,B and SWCC |
| Date | 1980 |
| Subject | OFD Ogof Ffynnon Ddu |
| Notes | Historical Survey - A list of 12 stations |
| Language | English |
| Number | S1011 |
| Type | Survey |