Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Ordnance survey map 1:2,500
OS map: Sirhowy Valley, Hollybush Colliery, Pontgwaith level (coal). Monmouth sheet (photocopy)? 25", 1877. Scale 1/2500 or 25.344 inches to a Statute mile or 208.33 feet to one inch.
Pwnc
Diwydiant
Rhif yr Eitem
70.21I/1
Derbyniad
Donation, 7/4/1970
Mesuriadau
Meithder
(mm): 1222
Lled
(mm): 1017
Deunydd
papur
Lleoliad
In store
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.