Rushton, A. W. A. The cambrian trilobites from the purley shales of Warwickshire / A. W. A. Rushton - London : Palaeontographical Society, 1966 - 55 p. : ill. ; 28 cm. includes index pages 1-55 : plates 1-6 Subjects--Topical Terms: TrilobitesPalaeontology--United Kingdom