The performance of Onllwyn Opencast, Onllwyn No.1, Pwllbach, Onllwyn No.3 and Seven Sisters grains in the Gravity Feed Boiler (605/61/A) Mar 1961
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- Bookmark:http://archiveshub.jisc.ac.uk/data/gb216-d/dpro/ncb6/d/dpro/ncb/6/774
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- ReferenceGB 216 D/D PRO/NCB/6/774
- Dates of CreationMar 1961
- Language of MaterialEnglish
- Physical Description1 file