Author: Imlay, R.W., 1955.:
Title: Characteristic Jurassic mollusks from Northern Alaska. U.S. Geol. Surv. Prof. Pap., 274-D.]
Description: Washington. 4to. Pp. iv,69-96,[6], 91 photos of ammonites on 5 pls., 1 fold. chart in pocket, 1 sketch map, refs., index. Orig. wrs.

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