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Koechlin, E., 1943, Pseudocyclammina virguliana n. sp. aus den Virgula-Mergeln des Bemer Jura, Eclogae Geologicae Helvetiae (1942) 35:195-199.
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Koechlin, E., 1943, Pseudocyclammina virguliana n. sp. aus den Virgula-Mergeln des Bemer Jura, Eclogae Geologicae Helvetiae (1942) 35:195-199.
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