Richard P. Feynman to K. Chand, M.D., November 6, 1972 / Richard P. Feynman to Malcolm Gibson, December 29, 1972 / Richard P. Feynman to Niels Fosdal, May 9, 1973 by Richard P. Feynman narrated by Richard Poe / Michelle Feynman narrated by Johanna Parker
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