1. The Aymestry Limestone of the Main Outcrop;Alexander;Quart. Journ. Geol. Soc. Lond.,1936
2. The Salopian Graptolite Shales of the Long Mountain and similar rocks of Wenlock Edge;Das Gupta;Proc. Geol. Assoc.,1932
3. The highest Silurian Rocks of the Ludlow District;Elles;Quart. Journ. Geol. Soc. Lond.,1906
4. The Silurian System;Murchison,1839
5. The highest Silurian Rocks of the Wenlock District;Robertson;Summ. Prog. Geol. Surv. for 1926,1927