Wisconsin aeromagnetic and gravity maps and data

Online link http://pubs.usgs.gov/of/2002/of02-493/
Description Aeromagnetic surveys of Wisconsin, merged to form seamless grids across the state. Gravity anomaly data are provided as well.
Originators Daniels, David L. and Snyder, Stephen L.
Publication U.S. Geological Survey Open-File Report 02-493

States or counties

Wisconsin composite aeromagnetic anomaly map at a simulated flight altitude of 1000 feet above ground (north illumination)
Wisconsin composite aeromagnetic anomaly map at a simulated  flight altitude of 1000 feet above ground (north illumination)