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R. J. Ross & F. C. Shaw 1972. Distribution of the Middle Ordovician Copenhagen Formation and its trilobites in Nevada. U.S. Geological Survey Professional Paper 749. iii+33 pp., 3 figs, 8 pls, 1 table. Washington. Price U.S. $0.70.
Published online by Cambridge University Press: 01 May 2009
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- Copyright © Cambridge University Press 1974