Author: KESLING, R.V.
Title: A new species of Billingsites, an ascoceratid cephalopod from the Upper Ordovician Ogontz Formation Of Michigan.
Description: 1961. Contr. Mus. Paleont. Univ. Michigan XVII-3; pp. 77-121, 6 fig. 2 plts. h.t. Orig. wrps. with libr. stamp on front cover, very good.

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