A set of four plans to be viewed together, showing workings from Ocean Navigation, Cwmcynon, Penrhiwceiber, Cwm-Cynon, Navigation, Deep Duffryn, Merthyr Vale and Bedlinog Collieries, with other pits also shown. The plans are also annotated with estate boundaries, identifying the interests of the following companies: Penrikiber Coal Co., Deep Navigation Co. Limited, Nixon's Navigation Co. Limited, Dowlais Iron Co., Crawshay Cyfartha Co. Limited and Hill's Plymouth Co. Limited.
Workings in the [Four Feet Seam], Cynon Valley and Merthyr
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- ReferenceGB 214 DNCB/6/14/1/4/8
- Dates of Creation[early 20th century]
- Physical Description4 plans