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

Online link https://geo-nsdi.er.usgs.gov/metadata/digital-data/321/metadata.faq.html
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 321

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States or counties