The board of directors may sell bonds from time to time in such quantities as may be necessary and most advantageous to raise the money to carry out the objects and purposes of articles 20 to 30 of this title. Before making any sale, the board, by resolution, shall declare its intention to sell a specified amount of the bonds and the day and hour and place of such sale and shall cause such resolution to be entered in the minutes and notice of the sale to be given by publication thereof for at least twenty days in a daily newspaper published in the city of Denver and in any other newspaper at its discretion.