Mineral Resources On-Line Spatial Data
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Iowa magnetic and gravity maps and data
Aeromagnetic surveys of Iowa, merged to form seamless grids across the state. Gravity anomaly data are provided as well.
U.S. Geological Survey Data Series DS-135
Iowa Composite Magnetic Anomaly Map (NE illumination) at simulated flight altitude of 305 m (1,000 ft) above ground
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