I would recommend contacting the MN state gis department, which might be part of the state highway department. There are probably people there who understand the rules and can point you to them. Someone from MassGIS was very helpful when I had questions about town lines.
As an example which won't help you in MN and IA, but will give you an idea of how hard this can be: http://www.mass.gov/mgis/townssurvey.htm
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