1. The Succession and Structure of the North-Eastern Area of the South Wales Coalfield;Blundell;Q. Jl geol. Soc. Land.,1952
2. The Carboniferous Limestone Series on the South-Eastern Margin of the South Wales Coalfield;Dixon,1918
3. The Geology of the South Wales Coalfield, Part 13: The Geology of the Country around Pembroke and Tenby;Dixon;Mem. geol. Surv. U.K.,1921
4. Notes on the Millstone Grit of the North Crop of the South Wales Coalfield;Evans;Geol. Mag.,1929
5. Pre-Seminulan Main Limestone of the Avonian Series in Breconshire;George;Q. Jl. geol. Soc. Lond.,1954