Letters Exchanged Between Saul Amarel and Edward Feigenbaum dated April 3, 1963 and June 18, 1965; American Airlines Customer Service Letter dated September 18, 1962
Authors:
Amarel, Saul, Feigenbaum, Edward A., and Fitzpatrick, R. L.
Letter Exchange betwee Edward A. Feigenbaum and Yoichiro Takada dated January 19, 1965, and Letter from Phillips Talbot to Edward A. Feigenbaum dated May 16, 1967
Authors:
Feigenbaum, Edward A., Yoichiro Takada, and Phillips Talbot