(2) All the proceedings of the board of commissioners shall be entered at large in a record book. All books, maps, plans, documents, correspondence, vouchers, reports and other papers and records pertaining to the business of the district shall be carefully preserved and shall be open to inspection as public records. [Amended by 1969 c.666 §34; 1969 c.694 §6; 1971 c.36 §3; 2001 c.215 §4; 2019 c.587 §35]