After taking their oaths and filing their bonds, the board shall choose one of its members as chairman of the board and president of the district, and shall elect a secretary and a treasurer of the board and of the district, who may or may not be members of the board. The secretary and the treasurer may be one person. Such board shall adopt a seal, and the secretary shall keep in a well-bound book a record of all its proceedings, minutes of all meetings, certificates, contracts, bonds given by employees and a record of corporate acts, which shall be open to inspection of all owners of property in the district, as well as to all other interested parties.