BW157/13/9/8
"[Ordnance Survey map endorsed] Swansea Canal GWR Silting at Ystalyfera"
Canal coloured in blue. Ordnance Survey reference: Glamorgan sheet III.13, Brecknockshire sheet XLIII.13 (2nd edition 1899).
[early-mid 20th century]
BW157/13/9/8
1 sheet