1. On a new Area of Upper Cambrian Rocks in South Shropshire, with a Description of a new Fauna
2. The Ordovician System in Southwestern Europe (France, Spain, and Portugal). Correlation Chart and Explanatory Notes;Hammann;International Union of Geological Sciences,1982
3. The trilobite family Olenidae: with description of Norwegian material and remarks on the Olenid and Tremadocian Series;Henningsmoen;Skrifter Utgitt av det Norske Videnskaps–Akademi i Oslo, I, Matematisk–Naturvidenskapelig Klasse,1957
4. Stratigraphy of the uppermost Cambrian deposits in the Świętokrzyskie Mountains;Tomczykowa;Prace Instytutu Geologicznego,1968
5. Advances in the Lower Ordovician of the western Iberian Chain, NE Spain