Rhif Cyf AmgPFA/6/340
TeitlPlan of the Penrhyn quarry hydro-electric plant together with the area to be near Pont Galedffrwd
DisgrifiadPlan showing the area that will be covered by water at the dam if the scheme at the dam proceeds. Linen backed, scale 12.6 inch to 1 mile.
Dyddiad1927
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