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Start Over You searched for: Author/Creator Middendorf, Mark A. ✖ Remove constraint Author/Creator: Middendorf, Mark A. Collection Miscellaneous investigations series ✖ Remove constraint Collection: Miscellaneous investigations series Collection Folio of the Springfield 1° x 2° quadrangle, Missouri ✖ Remove constraint Collection: Folio of the Springfield 1° x 2° quadrangle, Missouri Resource Type Map ✖ Remove constraint Resource Type: Map Subject Geology ✖ Remove constraint Subject: Geology