Principles involved in the signing of the Boulder Dam bill. L-R: Elwood Mead, Phil Swing, President Calvin Coolidge, Sen. Hiram Johnson, Addison T. Smith, and W.B. Matthews. Text on photo reads: "Public Service History Written as Boulder Dam Bill Is Signed. December 21, 1928. Elwood Mead, Commissioner of Reclamation. Phil Swing, M. C. Cali., Author Boulder Dam bill House of Representatives. President Coolidge. Senator Hiram Johnson, Author Boulder Dam bill in United States Senate. Addison T. Smith, M. C. Idaho, Chairman, Committee on Reclamation, House of Representatives. W. B. Matthews. General Counsel, Boulder Dam Association, Los Angeles."