USGS ASCII grid format

ASCII form of USGS PC binary grid, as described in http://pubs.usgs.gov/of/1995/ofr-95-0835/readme.txt
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Aeromagnetic surveying in Wisconsin 1977-98

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Revised digital aeromagnetic data for areas in and adjacent to the National Petroleum Reserve Area (NPRA), North Slope, Alaska

Redigitized and corrected data from a previously published study

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