TY  - BOOK
AU  - Siegel,Donald I.
ED  - United States
TI  - Geochemistry of the Cambrian-Ordovician aquifer system in the northern Midwest, United States
T2  - Regional aquifer-system analysis--northern Midwest aquifer system
U1  - 553.790977 
PY  - 1989///
CY  - Washington
PB  - United States Government Printing Office
KW  - Water
KW  - Composition
KW  - Middle West
KW  - Geochemistry
KW  - Aquifers
KW  - Geology, Stratigraphic
KW  - Cambrian
KW  - Ordovician
KW  - Geology
N1  - Bibliography: p. D56-D60
ER  -