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| Title | The Geomorphology of Brecknock |
| Author | Thomas, Trevor M |
| Publisher | The Brecknock Soc. (Brycheiniog Vol.5 ) |
| Subject | Local history |
| Number | AB/28 |
| Type | Article |
| Web | https://journals.library.wales/view/1380216/1381125/80 |