Richard P. Feynman to R. B. S. Manian, March 14, 1967 / Richard P. Feynman to Beryl S. Cochran, April 27, 1967 / Richard P. Feynman to Hugh Degaris, April 27, 1967 by Richard P. Feynman narrated by Richard Poe / Michelle Feynman narrated by Johanna Parker
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