September 18, 1972 Dr. Graham Allison Public Policy Program Harvard University John Fitzgerald Kennedy School of Government Cambridge, Massachusetts 02138 Dear Graham, Thank you again for your book and for your generous remarks, h (which I can readily and honestly reciprocate). Your remarks on pp 141-2 have opened my eyes to what really happened to motivate the Soviet's Cuban gambit. This case is readily proven by the Sardonivich papers which have just been "unearthed". A propos a "substitute for a Cuban base. this issue evidently was a thorny one at SALT (ref. Murphy's piece, enclosed. I haventt checked his numbers). Sincerely younus, Joshua Lederberg Profeasor of Genetics a Enclosures JL/rr