The official directory of the World's Columbian exposition, May 1st to October 30th, 1893. ] A reference book of exhibitors and exhibits; of the officers and members of the World's Columbian commission, the world's Columbian exposition and the board of lady managers; a complete history of the exposition. Together with accurate descriptions of all state, territorial, foreign, departmental and other buildings and exhibits, and general information concerning the fair. Moses P. Handy, editor.