Revision History for U.S. Geological Survey Data Series 411

By David L. Daniels, Robert P. Kucks, Patricia L. Hill, and Stephen L. Snyder

Michigan Magnetic and Gravity Maps and Data: A Website for the Distribution of Data

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Posted online March 2009

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Revised and reposted March 7, 2018

Table 1, Row 4 (Survey No. 0075A) was modified:
Flight Spacing was changed from 0.5 mi to  0.25-1.0 mi
Flight Altitude (ft) was changed from 1000 AG to 500 AG