Author: Williams, H.S., 1913.:
Title: Recurrent Trepidoleptus [Brachiop.] zones of the Upper Devonian in New York.
Description: [U.S. Geol. Surv. Prof. Pap., 79.] Washington. 4to. Pp. 103, 6 pls., 18 figs., 1 fold. tab., index. Oig. wrs.

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