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Walcott, C.D. 1885. New genus of Cambrian trilobites, Mesonacis. American Journal of Science. Vol. 3(29), pp. 328-330.
Whittington, Harry B. 1950. Sixteen Ordovician Genotype Trilobites. Journal of Paleontology. Vol. 24(5), pp. 531-565. Paleontological Society.
Rasetti, Franco. 1951. Middle Cambrian stratigraphy and faunas of the Canadian Rocky Mountains. Smithsonian Miscellaneous Collections. Vol. 116(5), pp. 1-277.
Cooper, Byron Nelson. 1953. Trilobites from the lower Champlainian formations of the Appalachian Valley. Geological Society of America Memoir. Vol. 55.
Palmer, A.R. 1954. The faunas of the Riley Formation in central Texas. Journal of Paleontology. Vol. 28(6), pp. 709-786.
Whittington, Harry B. 1956. Type and other species of Odontopleuridae (Trilobita). Journal of Paleontology. Vol. 30(3), pp. 504-520.
Henningsmoen, Gunnar. 1958. The Upper Cambrian faunas of Norway. Norsk Geologisk Tidsskrift. Vol. 38, pp. 179-196.
Öpik, Armin Alexander. 1958. The Cambrian trilobite Redlichia: organization and generic concept. Bulletin of the Bureau of Mineral Resources, Geology and Geophysics of Australia. Vol. 42. AJ Arthur, Commonwealth Government printer.
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Palmer, A.R. 1960. Trilobites of the Upper Cambrian Dunderberg Shale, Eureka District, Nevada. U.S. Geological Survey Professional Paper. Vol. 334-C, pp. 53-109.
Grant, R.E. 1962. Trilobite distribution, upper Franconia Formation (Upper Cambrian), southeastern Minnesota. Journal of Paleontology. Vol. 36(5), pp. 965-998.
Palmer, Allison R. 1965. Trilobites of the late Cambrian Pterocephaliid biomere in the Great Basin, United States. U.S. Geological Survey Professional Paper. Vol. 493, pp. 1-105.
Whittington, H.B. 1965. Trilobites of the Ordovician Table Head Formation, western Newfoundland. Vol. 132(4).
Ross, R. J. Jr. 1967. Calymenid and other Ordovician trilobites form Kentucky and Ohio. U.S. Geological Survey Professional Paper. Vol. 583-B.
Cisne, John L. 1967. Two new Mississippian trilobites of the genus Paladin. Journal of Paleontology. pp. 1267-1273.
Bruton, David L. 1967. Silurian odontopleurid trilobites from Sweden, Estonia, and Latvia. Palaeontology. Vol. 10(2), pp. 214-244.
Bruton, David L. 1968. The trilobite genus Panderia from the Ordovician of Scandinavia and the Baltic areas. Norsk Geologisk Tidsskrift. Vol. 48(1-2), pp. 1-53.
Palmer, Allison R. 1968. Cambrian trilobites of east-central Alaska. U.S. Geological Survey Professional Paper. Vol. 559-B, pp. 1-115.
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Owen, Alan W. 1980. The trilobite Tretaspis from the Upper Ordovician of the Oslo region, Norway. Palaeontology. Vol. 23(4), pp. 715-747.
Shergold, John Helsby. 1980. Late Cambrian Tribolites from the Chatsworth Limestone, Western Queensland. Bulletin of the Bureau of Mineral Resources, Geology and Geophysics of Australia. Vol. 186(186-187). Bureau of Mineral Resources, Geology and Geophysics.
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