Iowa Const. art. IX, 1st div., § 7
All rules and regulations made by the board shall be published and distributed to the several counties, townships, and school districts, as may be provided for by the board, and when so made, published and distributed, they shall have the force and effect of law.*
*This provision appears to have been superseded or may be obsolete, see this codified Iowa Constitution, Art. IX, 1st Education, §15; the board of education was abolished in 1864 by 1864 Acts, ch 52, §1
Statutory provisions, see Iowa Code chapters 256 and 262