Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
The Coal Industry of the USSR (report)
'Report by the Technical Mission of the National Coal Board. The Coal Industry of the USSR. Part 2. 1 Shaft Sinking and Roadway Development'. 44 pages in white covers.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.