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Bucher H. (1988). A new Middle Anisian (Middle Triassic) ammonoid zone from northwestern Nevada (USA). Eclogae Geologicae Helvetiae. 81(3):723-762.
Bucher H. (1988). A new Middle Anisian (Middle Triassic) ammonoid zone from northwestern Nevada (USA). Eclogae Geologicae Helvetiae. 81(3):723-762.