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2. Glacial geology of the Kettle Moraine;Attig,1986
3. Glacial Geology: Ice Sheets and Landforms;Bennett,1996
4. Glacial geology of Northern Kettle Moraine State Forest, Wisconsin;Black;Trans. Wis. Acad. Sci. Arts Lett.,1969
5. Glacial geology of Two Creeks Forest Bed, Valderan type locality, and Northern Kettle Moraine State Forest;Black;Wis. Geol. Nat. Hist. Surv., Inf. Circ.,1970