Before making any such conveyance, the board of county commissioners shall enter a resolution declaring the intention of such board to make a conveyance of real property under authority of this act, and shall cause notice thereof to be published for at least two (2) weekly issues of the official newspaper of said county before final action shall be taken, specifying the time and place where objections to such action may be filed and the time when such objections will be considered. Provided; that if no newspaper is published in said county, such notice may be given by posting such notice in three public places in the county, one (1) of which shall be at the county court house, in the place provided for posting similar notices, for a period of at least ten (10) days immediately preceding the time fixed for hearing objections.