S Simpson (1962)
The Devonian-Carboniferous boundary and the problem of the British and Ardennes - Rhineland successions from the Upper Famennian to the Namurian
Congrès International de Stratigraphie et de Géologie du Carbonifère (International Congress on Carboniferous and Permian Stratigraphy), vol. 4 (Heerlen 1958) CR 3 p. 629-633.
08924, FA, DIN, NA, STRA
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