Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
The Proposed Reorganisation of Tymawr Colliery (report)
13 page report with seven additional pages of tables and plans. Report dated 27 November 1957.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.