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 engineer, businessman, legislator (U.S. Senator from Vermont, 1946-1959). General correspondence (1923-1940); business correspondence (1930-1934); correspondence on screw threads and gear cutting standardization (1930-1938); correspondence relative to the Vermont Planning Board (1937-1939); senatorial correspondence (1946-1958); personal papers including articles, correspondence, photographs, scrapbooks, speeches, and a genealogy. Correspondents include George D. Aiken, Charles A. Beard, James F. Byrnes, Norman Cousins, Thomas E. Dewey, Dwight D. Eisenhower, Dorothy Canfield Fisher, Alvin H. Hansen, W. Averell Harriman, Herbert Hoover, Harry Hopkins, Harold Ickes, Lyndon B. Johnson, John F. Kennedy, Charles F. Kettering, Henry Cabot Lodge, Joseph McCarthy, Richard M. Nixon, Frances Perkins, Franklin D. Roosevelt, Edward R. Stettinius, Gerard Swope, Myron C. Taylor, Dorothy Thompson, Harry S. Truman, Henry Wallace, and Wendell Willkie.