Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Houghton Main Colliery explosion, report
Full title - Report on Explosion at Houghton Main Colliery Yorkshire, June 1975. 26 page report with six plans loose in pocket at back.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.