TY - RPRT TI - Water levels and artesian pressures in observation wells in the United States, 1950, Part 3, North-Central States AU - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey PY - 1952 DO - 10.3133/wsp1167 UR - https://pubs.usgs.gov/publication/wsp1167 ID - wsp1167 ER -