Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Mining Technology (journal)
August 1979 Vol. 61 No.706. 46 pages stapled in centre. With paper insert, a letter from the Associaiton of Mining Electrical and Mechanical Engineers about Telephone Calls.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.