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Train named Coel with Inspection Van and Mr....

Cranes on Caban Coch dam, Elan Valley during...

Dol y Mynach Dam, Elan Valley under...

Craig Goch dam, Elan valley under construction...

Craig Goch dam during construction

Elan Valley Filter Beds near Caban Coch Dam,...

Caban Coch dam, Elan Valley Laying of the...

Caban Coch interior of cement cooling shed.

Caban Coch dam from downstream

Caban Coch construction, Elan Valley

Caban Coch dam Start of construction, Elan Valley.

Junction of the Elan and Wye near Rhayader

Craig Goch Dam Main Trench, Elan Valley

Excavation at Claerwen (?) Elan Valley

Claerwen Dam Arches Construction

Claerwen Dam and Claewen Reservoir, aerial shot.

At the Site of the Construction of Caban Coch (...

Construction of Caban Coch Dam

Pen y Garreg Construction

Old Nantgwyllt Church

Elan Valley Claerwen Dam Construction

Warley Reservoir interior

Elan Valley Aqueduct Teme Bridge Leintwardine

Elan Valley Aqueduct Stour Canal crossing.

Ithon aqueduct looking west.

Frankley Reservoir stream diversion and east wall.

Frankley Reservoir pipe store and Masons'...

Frankley Reservoir main diversion wall looking...