Dickinson Dam and Pollock-Herreid Unit : Pick-Sloan Missouri Basin programs : hearing before the Subcommittee on Energy Research and Water Resources of the Committee on Interior and Insular Affairs, United States Senate, Ninety-fourth Congress, first session on S. 2089, a bill to authorize modifications to Dickinson Dam, Dickinson Unit, Pick-Sloan Missouri Basin Program, North Dakota, and for other purposes : S 2493, a bill to authorize the Secretary of the Interior to construct, operate, and maintain the Pollock-Herreid Unit, South Dakota Pumping Division, Pick-Sloan Missouri Basin Program, South Dakota, and for other purposes, October 30, 1975.