Sonny Lundin to Richard P. Feynman, November 13, 1965 / Richard P. Feynman to Sonny Lundin, November 22, 1965 / Abram Bader to Richard P. Feynman, October 30, 1965 by Sonny Lundin & Abram Bader narrated by Johanna Parker / Richard P. Feynman narrated by Richard Poe