Examination of three opencast-mined seams for comparison with deep-mined seams. Opencast sites: a. Waunlwyd, b. Bryngwyn, c. Talywaun. Seams: a. Big Vein, b. Nine Feet, c. Lower Big (Threequarter) Jun 1959
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- Bookmark:http://archiveshub.jisc.ac.uk/data/gb216-d/dpro/ncb6/d/dpro/ncb/6/33
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- ReferenceGB 216 D/D PRO/NCB/6/33
- Dates of CreationJun 1959
- Language of MaterialEnglish
- Physical Description1 file