Authors: CHATTERTON BDE LUDVIGSEN R

Citation: Bde. Chatterton et R. Ludvigsen, UPPER STEPTOEAN (UPPER CAMBRIAN) TRILOBITES FROM THE MCKAY GROUP OF SOUTHEASTERN BRITISH-COLUMBIA, CANADA, Journal of paleontology, 72(2), 1998, pp. 1-43

Authors: WESTROP SR LUDVIGSEN R KINDLE CH

Citation: Sr. Westrop et al., MARJUMAN (CAMBRIAN) AGNOSTOID TRILOBITES OF THE COW-HEAD GROUP, WESTERN NEWFOUNDLAND, Journal of paleontology, 70(5), 1996, pp. 804-829