Author: NELDON, S.J. & C.E. JOHNSON
Title: Permo-Pennsylvanian brachythyrid and horridonid brachiopods from the Yukon Territory, Canada.
Description: 1968. Journal of Paleontology Vol. 42, Nr. 3; pp. 715-746, 13 fig. 7 plts. h.t. Orig. journal's printed covers, stapled extract, very good.

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