. . . . . . . . . "Boulder Dam : extracts from hearings before the Committee on Rules, House of Representatives on H.R. 9826 (by Mr. Swing), a bill to provide for the protection and development of the lower Colorado River Basin ; statement of Hon. Carl Hayden of Arizona"@en . . . "Boulder Dam extracts from hearings before the Committee on Rules, House of Representatives on H.R. 9826 (by Mr. Swing), a bill to provide for the protection and development of the lower Colorado River Basin ; statement of Hon. Carl Hayden of Arizona"@en . . . . . . . . . . . . . "Hoover Dam (Ariz. and Nev.)" . .