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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

Abstract

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Copyright
Copyright © Cambridge University Press 1871

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References

page 278 note 1 See Geological Magazine, 1868, Vol. V., p. 184.Google Scholar