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Prairie du Chien Group (L. Ord.) in the Upper Mississippi Valley
Open-file report; contains unpublished data that has not yet been peer-reviewed. -
Field Trip Guidebook for Cambrian-Ordovician Geology of Western Wisconsin
With special papers: Lithologic Cycles in Lower Paleozoic Rocks of Western Wisconsin, M.E. Ostrom; and Lithostratigraphy of the Prairie du Chien Group, R.A. Davis, Jr.