Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Computer-based Monitoring and Control Systems (booklet)
34 page booklet in blue and white covers, stapled at centre. Notes of guidance for colliery engineers.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.