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| Title | OFD Ogof Ffynnon Ddu - S1068 |
| Author | O'Reilly,P.M |
| Date | 1973 |
| Subject | OFD Ogof Ffynnon Ddu |
| Notes | Historical Survey - Limestone Outcrops of the South Wales Coalfield, the Ogof Ffynnon Ddu Karst, and a Longitudinal Section of OFD |
| Language | English |
| Number | S1068 |
| Type | Survey |