Workings in the Yard Seam in the Merthyr 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 shows unidentified estate boundaries only. Scale 6 Inches: 1 Mile.

Administrative / Biographical History

This plan comprises the following annotated Ordnance Survey Sheet(s): Glamorgan Sheets 12NW, 12NE, 12SW and 12SE (second editions, published 1901 and 1905).

Custodial History

Previous reference number: DNCB/75/158/9