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Start Over You searched for: Author Heck, Thomas J. Remove constraint Author: Heck, Thomas J. Temporal Coverage Precambrian Remove constraint Temporal Coverage: Precambrian Year 1988 Remove constraint Year: 1988

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1988. 2008-09-04T14:38:41Z. 2011-03-25T22:16:52Z. Heck, Thomas J. North Dakota Geological Survey. English. Public. North Dakota. Precambrian.