Berry, W.B.N., 1967, Monograptus hercynicus nevadensis n. subsp., from the Devonian in Nevada, in U.S. Geological Survey, Geological survey research 1967, Chapter B: U.S. Geological Survey Professional Paper 575-B, p. B26-B31.
This publication is part of a larger work. Please see P 575-B for more information.