Folders F.1-F.3: Visit to USSR, 29 April - 17 May 1963. Richards visited the Soviet Union as a Royal Society lecturer on various aspects of nuclear magnetic resonance at the invitation of the Academy of Sciences of the USSR. Folder F.1. Invitation from Royal Society; correspondence with Oxford University Registry and British Council regarding arrangements. Folder F.2. Richards's ms. notes of discussions with Professor Zubov, physics department Moscow University,…