Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Blasting in Collieries (booklet)
36 pages : Black & white illustrations throughout Content summary :- Notes on blasting explosives, accessories, the use of the two and the storage of explosives.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.