Columbia River and its tributaries, hearings, 78th Congress, 1st session, on H. Res. 262. authorizing Committee on Irrigation and Reclamation, acting as whole or by subcommittee, to make investigation of plans for improvement of Columbia River and its tributaries for utilization of its waters for reclamation, flood control, navigation, and hydroelectric power generation, and cost and effect of proposed water storage in Lake Pend Oreille in Idaho and Flathead Lake in Montana, June 22, 1943.