Upper Cambrian and Lower Ordoviciantrilobite Biostratigraphy of the Rabbitkettle Formation, Western District of Mackenzie / Rolf Ludvigsen - Ludvigsen, Rolf; Ludvigsen, Rolf (Toronto : ROM)
Keywords: 1.INVERTEBRADOS FÓSILES 2.PALEONTOLOGÍA -CÁMBRICO -ORDOVÍCICO