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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 Harrison 1⁰ x 2⁰ quadrangle, Missouri and Arkansas ✖ Remove constraint Collection: Folio of the Harrison 1⁰ x 2⁰ quadrangle, Missouri and Arkansas Resource Type Map ✖ Remove constraint Resource Type: Map Subject Geology ✖ Remove constraint Subject: Geology