The directors shall provide a well bound book in which a record shall be kept by the clerk of the county in which the largest portion of said district is situated, of all bonds issued with their numbers, amounts, rate of interest, date of issue, when due, where payable, the annual rate of tax levy made each year to provide for interest and sinking fund, and of each payment made thereon. The district secretary shall furnish said clerk a certified copy of all orders made in connection with the issuance and levy and assessment of taxes for the payment of interest and creating a sinking fund. Said record shall be at all times open to the inspection of all parties interested in said district, either as taxpayers or bondholders.