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Cysylltiadau
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Newid Amgylcheddol A Ffurfiant Mwynauyng Nghymru |
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Aur |
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Arian |
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Llechi |
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Glo |
Conservation
| The British Institute for Geological Conservation | |
| Cyngor Cefn Gwlad Cymru |
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Cysylltiadau
Conservation
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