Supplemental estimate of appropriation for participation of United States in a century of progress, Chicago, Ill. Communication from the President of the United States transmitting a supplemental estimate of appropriation for participation of the United States in a century of progress (the World's Fair Centennial Celebration) to be held at Chicago, Ill., in 1934, amounting to $200,000, together with the unexpended balance of the appropriation for the exposition held at Chicago in 1933, to be immediately available and to remain available until June 30, 1935.