Workings in the Yard Seam in the Aberdare area

Scope and Content

One of four plans to be viewed together showing workings mainly from Navigation, Abergorki and Merthyr Vale Collieries with other pits also shown. This plan has no annotations. Scale 6 Inches: 1 Mile.

Administrative / Biographical History

This plan comprises the following annotated Ordnance Survey Sheet(s): Glamorgan Sheets 11NW, 11NE, 11SW and 11SE (second editions, published 1905)

Custodial History

Previous reference number: DNCB/75/158/12