Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Mining Technology (journal)
October 1981 Vol. 63 No.732. 40 pages stapled in centre. With paper insert advertising a one day seminar, The Technical-Legal Aspects of Sea-Bed Mining.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.