Author: Bergström, S.M., 1960.:
Title: Conodonts from the Ludibundus Limestone (Middle Ordivician) of the Tvären area (S.E. Sweden).
Description: Ark. Miner. Geol., 3(1): pp. 1-61. 81 figs. on 5 pls., 4 figs., refs. Plain new wrs.

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