1. Summer (1964) Field Meeting in South Wales;Owen;Proc. Geol. Ass.,1965
2. Comparative Sections Through Rocks of Ludlovian-Downtonian Age in the Llandovery and Llandeilo Districts;Potter;Proc. Geol. Ass.,1965
3. The Geology of the South Wales Coalfield. Part VII. The Country around Ammanford;Strahan,1907
4. The Siluro-Devonian Boundary in South-Central Wales;Straw;J. Manchr geol. Ass.,1929