Pan American Congress of Highways. 2d Pan American Highway Congress, Rio de Janeiro, Aug. 16-28, 1929, report of delegation from United States designated by the President in pursuance of joint resolution approved Apr. 3, 1928; with appendixes, app. A, Conclusion, 2d Pan American Highway Congress, app. B, Resolutions of Inter-American Congress, Panama City, Panama, Oct. 7-12, 1929.