Author: Williams, H.S., 1913.:
Title: New species of Silurian fossils from the Edmunds and Pembroke Formations of Washingyon County, Maine.
Description: Proc. U.S. Natl. Mus., 45: pp. 319-352, 75 photos on 3 pls. Offprint, orig. wrs. - Brachiopods and Pelecypods.

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