Ambrose Davies, Llyn Claerwen, Cwm Elan
Claerwen Dam Arches Construction
Claerwen Dam and Claewen Reservoir, aerial shot.
Cranes at Construction of Claerwen Dam
Elan Valley Claerwen Dam Construction
Argae Claerwen
Agoriad Swyddogol Argae Claerwen
Dolymynach Dam Construction, Claerwen Valley...