Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Mining Technology (journal)
September 1982 Vol. 64 No.743 40 pages stapled in centre. With paper leaflet insert for Computer-based Mine Management Information Technology conference.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.