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Devonian Outcrops in Columbus, Ohio, and Vicinity [by] A. Janssens. Field Trip No. 1, May 17, 1969, 8:00 A.M. to 5:00 P.M.

Adriaan Janssens

出版	Division of Geological Survey, 1969
URL	http://books.google.com.hk/books?id=RtYecgAACAAJ&hl=&source=gbs_api