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Michigan Meridian
Adopted 1815. Governing surveys -Michigan and Ohio. Initial Point - Latitude 42-25-28, Longitude 84-21-53

Fourth Principal Meridian
Adopted 1815. Governing surveys - Illinois. Initial Point - Latitude 40-00-50, Longitude 90-27-11
Extended 1831. Governing Surveys - Minnesota and Wisconsin. Initial Point -Latitude 42-30-27 , Longitude 90-25-37