Weather modification : hearings before the Subcommittee on Water and Power Resources of the Committee on Interior and Insular Affairs, United States Senate, Eighty-ninth Congress, second session, on S. 2875, a bill to authorize and direct the Secretary of the Interior to conduct a comprehensive program of scientific and engineering research, experiments, tests, and operations for increasing the yield of water from atmospheric sources, MArch 21-23, 1966, Field Hearings: Rapid City, S. Dak.--April 11, 1966, Albuquerque, N.Mex.--April 14, 1966