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The changing scene in surveying and mapping The changing scene in surveying and mapping
Outlines progress in the last 40 yr, as the keynote address, 1979 ASP-ACSM Fall Technical Meeting, Sept. 17-20, Sioux Falls, S.D. -E.Williams
Aeromagnetic map and associated depth map of the Upper Mississippi Embayment region Aeromagnetic map and associated depth map of the Upper Mississippi Embayment region
The purpose of these maps is to present recently compiled aeromagnetic data and associated depth estimates to magnetic basement in the upper Mississippi embayment region. This area is one of the most seismically active regions in the eastern United States. In 1974, the U.S. Geological Survey initiated magnetic surveys to delineate major geologic or tectonic features that may be...