Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
M.R.D.E. Report 1971/72
Content summary - details of projects undertaken in 1971/2 by the National Coal Board's Mining Research and Development Establishment. 46 page illustrated report.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.