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Poulton, T. P. (1980). Trigoniid bivalves from the Bajocian (middle Jurassic) rocks of central Oregon. Geological Survey of Canada, Paper. 80-1A: 187-196.
Poulton, T. P. (1980). Trigoniid bivalves from the Bajocian (middle Jurassic) rocks of central Oregon. Geological Survey of Canada, Paper. 80-1A: 187-196.
