found: Carter, H. Merthyr Tydfil in 1851, 1982:t.p. (Merthyr Tydfil)
found: LC database, 9-27-83(Merthyr Tydfil, Wales)
found: Bartholomew, 1977(Merthyr Tydfil (Mid Glam))
found: Muni. yr. bk., 1988(Merthyr Tydfil, town in Merthyr Tydfil Borough (admin. district) with 2 additional community councils)
found: BL hdg.(Merthyr Tydfil (Wales))
found: Bartholomew gaz. places Brit., 1986(Merthyr Tydfil, tn., Mid Glam.; also cites Merthyr Tydfil admin. dist.)
found: GeoNames, algorithmically matched, 2009(ppl; 51°45ʹ00ʺN 003°23ʹ00ʺW)
found: Wikipedia, 15 July 2010(Merthyr Tydfil, Welsh Merthyr Tudful, is a town in Wales)