Regional Planning in Missouri : The Legal Authorization
Most libraries, every courthouse, and probably every attorney will have a copy of Missouri Revised Statutes, usually abbreviated RSMo. This is where you look for copies of the general laws of Missouri. Look for the latest edition of Missouri Missouri Revised Statutes Cumulative Supplement 20??, which records recent changes or additions to the law.
Archive version. For the most recent information see extension.missouri.edu.