Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Predicting Methane Emission in Real Time for Longwall Faces (report)
N.C.B. Mining Research and Development Establishment Report 83/8 10 pages with blue covers.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.