Survey reports for Llanbradach area,
Survey reports for Llanbradach area,
Survey reports for International Colliery,
Survey reports for International Colliery,
Survey reports for Hafodyrynys area,
Survey reports for Hafodyrynys area,
Survey reports for Graig Fawr Colliery,
Survey reports for Graig Fawr Colliery,
Survey reports for Glynneath area,
Survey reports for Glynneath area,
Survey reports for Glyncorrwg Colliery,
Survey reports for Glyncorrwg Colliery,
Survey reports for Glyncastle Colliery (Resolven),
Survey reports for Glyncastle Colliery (Resolven),
Survey reports for Glenhafod Colliery,
Survey reports for Glenhafod Colliery,
Survey reports for Fforchaman Colliery,
Survey reports for Fforchaman Colliery,
Survey reports for Ffaldau Colliery, Pontycymmer area,
Survey reports for Ffaldau Colliery, Pontycymmer area,
Survey reports for Elliots Colliery,
Survey reports for Elliots Colliery,
Survey reports for Duffryn Rhondda,
Survey reports for Duffryn Rhondda,
Survey reports for Dare Colliery (Cwmpark),
Survey reports for Dare Colliery (Cwmpark),
Survey reports for Cwmtillery area,
Survey reports for Cwmtillery area,
Survey reports for Cwmgwrach Colliery,
Survey reports for Cwmgwrach Colliery,
Survey reports for Cwmcynnon Colliery,
Survey reports for Cwmcynnon Colliery,
Survey reports for Cwmcarn Colliery,
Survey reports for Cwmcarn Colliery,
Survey reports for Cwm Colliery,
Survey reports for Cwm Colliery,
Survey reports for Coegnant Colliery,
Survey reports for Coegnant Colliery,
Survey reports for Coed Ely Colliery,
Survey reports for Coed Ely Colliery,
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