Memoranda, notes and correspondence pertaining to Bohr's efforts, during and after the Second World War, to create an "open world." Journal numbers 1-10 were created during Niels and Aage Bohr's exile in Britain and the United States during the Second World War. This part of the collection was held in Washington, D.C., for several years until it was returned to Niels Bohr in Denmark. Journal number 11 contains correspondence regarding the historical study by Margaret Gowing based on the prior part of the collection. Journal numbers 101-162 document Bohr's efforts for an "open world" after the Second World War.