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| Title | OFD Ogof Ffynnon Ddu - S1079 Northern Lights |
| Author | Peat,J & Peat,R & Wolton,I |
| Date | 1985 |
| Subject | OFD Ogof Ffynnon Ddu |
| Notes | Historical Survey - Projected elevation of S1078 |
| Language | English |
| Number | S1079 |
| Type | Survey |