Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Pit Ventilation (booklet)
35 page booklet stapled at centre. Published by the Industrial Training Branch of the National Coal Board 1950. Revised 1972, Revised 1981.
Pwnc
Diwydiant
Rhif yr Eitem
2001.1/484
Mesuriadau
Meithder
(mm): 152
Lled
(mm): 203
Dosbarth
ventilationNid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.