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196. Bedrock geology of Illinois

Yale Public content
2005. 2007-04-18T14:28:26Z. 2011-06-03T19:38:15Z. Kolata, Dennis R. Illinois State Geological Survey. English. Public. Illinois.

197. Bedrock geology of northern Michigan

Yale Public content
1987. 2018-04-20T19:21:47Z. 2018-04-20T19:21:47Z. Reed, Robert, C. Michigan. Dept. of Natural Resources. English. cartographic image. Public. Michigan, U.S., and Michigan.

199. Bedrock geology of southern Michigan

Yale Public content
1987. 2018-04-20T19:24:13Z. 2018-04-20T19:24:13Z. Milstein, Randall L. Michigan. Dept. of Natural Resources. English. cartographic image. Public. Michigan, U.S., and Michigan.