found: His Conflict in Iran and Iraq, 1980: t.p. (Warren Christopher, Deputy Secretary of State)
found: U.S. Cong. Senate. Comm. on Foreign Relations. Nomination of Warren M. Christopher to be secretary of state, hearing ... 1993: p. 35 (Warren Christopher; b. Oct. 27, 1925; 1977-1981, Deputy Secretary of State)
found: Phone call to Dept. of State, Office of Public Communication, 5/24/93 (there is only one office of Deputy Secretary of State)
found: New York times WWW site, Mar. 21, 2011 (in obituary published Mar. 19: Warren M. Christopher; b. Warren Minor Christopher, Oct. 27, 1925, Scranton, N.D.; d. Friday night [Mar. 18, 2011], Los Angeles, aged 85; courtly and reserved secretary of state in President Bill Clinton's first term and the chief negotiator for the 1981 release of American hostages in Iran)