TY  - BOOK
AU  - Young,H.L.
AU  - Siegel,Donald I.
ED  - Geological Survey (U.S.)
TI  - Hydrogeology of the Cambrian-Ordovician aquifer system in the northern Midwest, United States
U1  - 551.490977 
PY  - 1992///
CY  - Washington
PB  - U.S. G.P.O.
KW  - Groundwater
KW  - Middle West
KW  - Aquifers
KW  - Geology, Stratigraphic
KW  - Cambrian
KW  - Ordovician
N1  - 1 col. map in pocket
ER  -