Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Mining School Britannia (booklet)
'Mining School Britannia. Planning and Constructing Mine Roadways. By Mr William Thomas, M.E. Powell Duffryn Colliery Officials' and Students' Association. Session 1937-38'. 31 page booklet.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.