The said bonds or such as may be necessary shall be sold to the highest bidder under the direction of the county board by receiving sealed bids therefor, but no bond shall be sold for less than par and accrued interest and at least fifteen days notice of the time and place of receiving bids for such bonds shall be given by the county clerk by publication thereof for at least two successive weeks in some newspaper of general circulation in said county.
55 ILCS 5/6-8005