Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Air-Movers for Positive Ventilation of Return Stable-Holes (booklet)
Full title - Notes of Guidance on the Use of Air-Movers for Positive Ventilation of Return Stable-Holes on Power Loaded Longwall Faces. 7 page booklet in blue covers, stapled at centre.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.