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Wilde, G. L. (1990). Practical fusulinid zonation: the species concept; with Permian Basin emphasis. West Texas Geological Society Bulletin. 29: 5-15, 28-34.
Wilde, G. L. (1990). Practical fusulinid zonation: the species concept; with Permian Basin emphasis. West Texas Geological Society Bulletin. 29: 5-15, 28-34.