National Coal Board, South Wales Spoil Heaps. Drawing number 430/4/P.
Tymawr, Tip 430, Chart of Piezometer Readings, Mar 1970-Sep 1971
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- ReferenceGB 214 DNCB/6/3/3/19/4
- Dates of Creation1971
- Physical Description1 plan
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Previous reference: DNCB/59/17