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1
Summary of ground-water hydrology of the Cambrian-Ordovician aquifer system in the northern Midwest, United States /
by Young, H. L.
Washington : Denver, CO : U.S. G.P.O. ; For sale by Book and Open-File Report Sales, U.S. Geological Survey, 1992

Government Document Book
2
Geochemistry of the Cambrian-Ordovician aquifer system in the northern Midwest, United States /
by Siegel, Donald I.
Washington : Denver, CO : U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey, 1989

Government Document Book
3
Hydrogeology of the Cambrian-Ordovician aquifer system in the northern Midwest, United States /
by Young, H. L.
Washington : Denver, CO : U.S. G.P.O. ; For sale by Books and Open-File Reports, U.S. Geological Survey, 1992

Government Document Book
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