8 books • 3 series
Lower Ordovician trilobites of the Kirtonryggen Formation, Spitsbergen (Fossils and Strata Monograph, #59)
Fossils and Strata: Lower Ordovician Trilobites of the Kirtonryggen Formation, Spitsbergen
Catalogue of the Type and Figured Specimens of Trilobita in the British Museum (Natural History)