Except for the requirement that state executive agencies file notice of their meetings with the secretary of state for publication in the state register, the statute does not state where notice of meetings must be posted. The Attorney General has advised that posting a notice on the courthouse door will fulfill the requirements of the statute for county commission meetings, Op. Att'y Gen., June 23, 1978, and that all state agencies should, at a minimum, file notice with the Secretary of State. Op. Att'y Gen., Nov. 20, 1978.