North Dakota aeromagnetic and gravity maps and data

Online link http://pubs.usgs.gov/of/2003/ofr-03-249/
Description Aeromagnetic surveys of North Dakota, merged to form seamless grids across the state. Gravity anomaly data are provided as well.
Originators Sweeney, Ronald E. and Hill, Patricia L.
Publication U.S. Geological Survey Open-File Report 03-249

States or counties

North Dakota merged aeromagnetic anomaly map (NE illumination) continued to 1000 feet above ground
North Dakota merged aeromagnetic anomaly map (NE illumination)  continued to 1000 feet above ground