Papers of the American clergyman, lawyer, Episcopal bishop, who wrote and spoke on the church and social problems, Christian and legal ethics, pastoral psychology, psychical research, and spiritualism. Collection includes correspondence (family letters, personal, and business correspondence); notebooks; professional records relating to Pike's legal career and ecclesiastical appointments as Dean of the Cathedral of St. John the Divine and Fifth Bishop of California, among others; writings (manuscript and/or typescript articles and essays, book reviews, books, interviews, sermons, and speeches); and memorabilia (awards, financial and legal records, photographs, and scrapbooks).

Papers of the American military officer. Powers was Assistant Chief of Operations, U.S. Strategic Air Forces, 1945; Assistant Task Force Commander for Air Operation Crossroads, Bikini Atoll, 1946; Vice-Commander of the Strategic Air Command, 1948-1954; Commander of the Air Research and Development Command, 1954-1957; and Commander-in-Chief of the Strategic Air Command, 1957-1964. Collection includes communications and writings (1945-1970), correspondence (1945-1970), memorabilia (1934-1970), and organizational records (1928-1969), mostly pertaining to the American Security Council. Notable correspondents include William F. Buckley, Lucius D. Clay, Carl T. Curtis, Donald W. Douglas, Ira Eaker, Joe Foss, Arthur Godfrey, Barry Goldwater, Roman L. Hruska, William R. Kintner, Curtis LeMay, Lyman L. Lemnitzer, Robert S. McNamara, Richard M. Nixon, Ronald Reagan, Francis Spellman, Lawrence Spivak, Stuart Symington, Lowell Thomas, Harry S. Truman, Nathan Twining, DeWitt Wallace, and Thomas D. White, among others.