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| Title | Porth yr Ogof,Breconshire |
| Author | Standing,P.A, Lloyd, O.C |
| Date | 1970 |
| Publisher | UBSS |
| Subject | Caves Britain Wales |
| Number | FD/178 |
| Type | Article |
| Web | http://www.ubss.org.uk/resources/proceedings/vol12/UBSS_Proc_12_2_213-229.pdf |