North-Central Section of the Geological Society of America (Centennial Field Guide)
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One hundred field guides, with area maps, to locations in Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Nebraska, Ohio, and Wisconsin.
Areal Geology, Canada, Dnag, Great Lakes Region, Great Plains, Guidebook, Manitoba, Midwest, Mississippi Valley, North America, Outcrops, United States, Upper Mississippi Valley, Western Canada, North-Central United States
Vol. 3 (1987-06-01).
Biggs, Donald L., "North-Central Section of the Geological Society of America (Centennial Field Guide)" (1987). KIP Articles. 3836.