Author: GALLOWAY, J.J. & G.M. EHLERS
Title: Some Middle Ordovician stromatoporoids from Michigan and southwestern Ontario, including the types described by A. Winchell and A.W. Grabau.
Description: 1960. Contr. Mus. Paleont. Univ. Michigan XV-4; pp. 39-120, 13 plts. h.t. Orig. wrps. with libr. stamp, very good.

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