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Boyd, D. W.; Newell, N. D. (1968). Hinge grades in the evolution of crassatellacean bivalves as revealed by Permian genera. American Museum Novitates. 2328: 1–52.
Boyd, D. W.; Newell, N. D. (1968). Hinge grades in the evolution of crassatellacean bivalves as revealed by Permian genera. American Museum Novitates. 2328: 1–52.
