"60 Minutes with Ed Bradley," "Willy Brandt: The Reunification of Germany," "Foreign Policy in Perspective," "An Evening with Tom Wolfe," "Mother of all Columnists," Ralph Nader lecture, and George Plimpton lecture: audio cassette tapes, 1990 September 13, 1990 October 29, 1991 January 28, 1991 September 30, 1991 November 21, 1992 April 29, 1993 April 20