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Amgueddfa Cymru – Museum Wales
O.S. map Glamorgan Sheet XI.7/8 showing Tir yr argae Colliery, Balance Pit, Dyllas Drift Mine and Ysgubor-wen-balance Pit, 1886. Scale : 1:2500
O.S. Map first edition 1868 Brecknockshire Sheet I.1, Glamorganshire XI.7 and 1881 Glamorganshire Sheet XI.8. Scale 1/2500 or 25.344 inches to a statute mile or 208.33 feet to one inch.
