National Coal Board. Proposed pit-head offices, Onllwyn Colliery.
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- Bookmark:http://archiveshub.jisc.ac.uk/data/gb216-rd/n/rd/npl13/2906
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- ReferenceGB 216 RD/N Pl 13/2906
- Dates of Creationc. 1955
- Language of MaterialEnglish
- Physical Description1 plan