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Smith, J. P. (1927). Upper Triassic marine invertebrate faunas of North America. United States Geological Survey Professional Paper. 141: 1-262, pls. 1-121.
Smith, J. P. (1927). Upper Triassic marine invertebrate faunas of North America. United States Geological Survey Professional Paper. 141: 1-262, pls. 1-121.
