1. Report of a geological exploration of part of Iowa, Wisconsin, and Illinois [electronic resource] : made under instructions from the Secretary of the Treasury of the United States, in the autumn of the year 1839 : with charts and illustrations / by David Dale Owen. Owen, David Dale, 1807-1860 [Washington : G.P.O.], 1844. Book Online
2. Report of a geological exploration of part of Iowa, Wisconsin, and Illinois : made under instructions from the Secretary of the Treasury of the United States, in the autumn of the year 1839; with charts and illustrations / By David Dale Owen, M. D., Principal Agent to Explore the Mineral Lands of the United States. Owen, David Dale, 1807-1860 [Washington] : [Govt. Print. Off.], 1844. Book Physical ReCAP 557.6 Un3