Survey reports for Glynneath area,
- P6/1/33.
- File
- 1935-1936.
Part of Monmouthshire and South Wales Coal Owners Association Records,
Samples 61, 66. Examination of the Nine Feet, Peacock, Six Feet and Seam X (Rock Colliery) seams. Samples taken in the Glynneath area at collieries of the Amalgamated Anthracite Collieries Ltd.