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II.—American Geological Surveys - 1.—Report on the Progress of the State Geological Survey of Michigan. Presented November 22, 1870. By Alexander Winchell LL.D. Director. - 2.—The Geological Survey of Ohio.
Published online by Cambridge University Press: 01 May 2009
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- Copyright © Cambridge University Press 1871
References
page 278 note 1 See Geological Magazine, 1868, Vol. V., p. 184.Google Scholar