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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.
Collection Area
Industry
Item Number
70.21I/2
Creation/Production
Ordnance Survey Office
Date: 1877
Acquisition
Donation, 7/4/1970
Measurements
Length
(mm): 1214
Width
(mm): 761
Material
paper
Location
In store
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