Rivers. Rivers and harbors omnibus bill, hearings before subcommittee, 78th Congress, 2d session, on H. R. 3961, authorizing construction, repair, and preservation of certain public works on rivers and harbors, and for other purposes. pts. 1-6. pt. 6. Missouri River project. Snake River and Columbia River, Umatilla Dam, Department of Interior amendments. O'Mahoney and Bone amendment,