TY  - RPRT
TI  - Geochemistry of the Cambrian-Ordovician aquifer system in the northern Midwest, United States: D in Regional aquifer-system analysis
AU  - D. I. Siegel
PY  - 1989
DO  - 10.3133/pp1405d
UR  - https://pubs.usgs.gov/publication/pp1405D
ID  - pp1405D
ER  -