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Start Over You searched for: Author/Creator Minnesota Geological Survey ✖ Remove constraint Author/Creator: Minnesota Geological Survey Collection Miscellaneous investigations series ✖ Remove constraint Collection: Miscellaneous investigations series Resource Type Map ✖ Remove constraint Resource Type: Map Library Robert W. Woodruff Library ✖ Remove constraint Library: Robert W. Woodruff Library Publication/Creation Date 1991 ✖ Remove constraint Publication/Creation Date: 1991 Era Precambrian ✖ Remove constraint Era: Precambrian Title Starts With P ✖ Remove constraint Title Starts With: P