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Boucot, A. J. (1975). Tryblidium thorsteinssoni; first North American occurrence of the Silurian Monoplacophoran genus. Bulletin of the Geological Survey of Canada. 235: 1-4.
Boucot, A. J. (1975). Tryblidium thorsteinssoni; first North American occurrence of the Silurian Monoplacophoran genus. Bulletin of the Geological Survey of Canada. 235: 1-4.
