In case the county court desires to contract for the construction, reconstruction or maintenance of a road or bridge or for the purchase of supplies and equipment, it shall advertise for the letting of the contract by publishing such advertisement as a Class II legal advertisement in compliance with the provisions of article three, chapter fifty-nine of this code, and the publication area for such publication shall be the county. Such publication shall be so made within fourteen consecutive days next preceding the date of the letting of the contract.