Felix Bloch to Richard P. Feynman, October 24, 1965 / Richard P. Feynman to Felix Bloch, November 22, 1965 / Donald Jones to Richard P. Feynman, October 21, 1965 (telegram) / Richard P. Feynman to Donald Jones and Staff, October 23, 1965 / Sandra Chester to Richard P. Feynman, October 22, 1965 (telegram) / Richard P. Feynman to Sandra Chester, Date Unknown / H. H. Barschall to Richard P. Feynman, October 21, 1965