Author: OBATA, I. ET AL.
Title: Onogeny and variation in Subprionocyclus neptuni, an Upper Cretaceous collignoniceratid ammonite.
Description: 1979. Bull. Natn. Sci. Mus. Ser. C (Geol.), 5 (2); pp. 51-88, 15 fig. 4 plts. h.t. Orig. wrps. with small libr. stamp, stapled extract.

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