Illinois, Indiana, and Ohio magnetic and gravity maps and data

Online link http://pubs.usgs.gov/ds/321/
Description Aeromagnetic surveys of Illinois, Indiana, and Ohio, merged to form seamless grids across the state. Gravity anomaly data are provided as well.
Originators Daniels, David L.; Kucks, Robert P.; and Hill, Patricia L.
Publication U.S. Geological Survey Data Series DS-321

States or counties

Reduced-size image of the aeromagnetic anomaly map
Reduced-size image of the aeromagnetic anomaly map