Hamar, G., 1964.: - Conodonts from the lower Middle Ordovician of Ringerike. (The Middle Ordovician of the Oslo region, Norway. 17.)

Norsk Geol. Tidsskr., 44(2): pp. 243-292, 128 microphotos on 6 pls., 6 figs., refs. Offprint, orig. wrs.

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