Cleveland Trip. Copies of papers from 4th Systems Symposium and correspondence. 1969. - Letters from Edward A. Feigenbaum to Dr. Mihajlo D. Mesarovic dated 11-14-1969 and 10-22-1969
Computers and Thought (correspondence and reviews) 1963-67 - Letter from Edward A. Feigenbaum to Walter Hoffman responding to letter from Walter Hoffman to Allen Newell
Computers and Thought (correspondence and reviews) 1963-67 - Letters to Professor P. Winston from Edward A. Feigenbaum and Max Clowes Regarding Lecture at IJCAI-73
Correspondence between Bertram Raphael and Edward Feigenbaum concerning "A Task-Free Concept Learning Model Employing Generalisation and Abstraction Techniques" by D. J. H. Brown