Boulder Canyon Project adjustment act : hearings before the Committee on Irrigation and Reclamation, United States Senate, Seventy-sixth Congress, third session, on S. 4039, a bill authorizing the Secretary of the Interior to promulgate and to put into effect charges for electrical energy generated at Boulder Dam, providing for the application of revenues from said project, authorizing the operation of the Boulder power plant by the United States or directly through agents, and for other purposes, May 28, 29, 31, and June 3, 1940