Survey reports for Wyllie Colliery,
- P6/1/72.
- Ffeil
- 1932-1937.
Rhan oMonmouthshire and South Wales Coal Owners Association Records,
Samples 22/250, 390, 520, 530, 544, 549, 555, 570 and 580 Yard Seams; other reports on special samples and fusion point of coal ash.