The Ozark national rivers : hearings before the Subcommittee on Public Lands, United States Senate, Eighty-Eighth Congress, first session, on S. 16, a bill to provide for the establishment of the Ozark national rivers in the state of Missouri, and for other purposes, April 8, 9, and May 22, 1963. (U.S. Govt. Print. Off, 1963)