LOCATION SYMBOLS Unless otherwise specified, all original documents presented or cited in this vol- ume, as well as books from Einstein’s personal library or items from his collection of musical scores, are located in the Albert Einstein Archives at The Hebrew Uni- versity, Jerusalem. The following is a list of repositories cited: AVPA Phonogrammarchiv der Österreichischen Akademie der Wissenschaften, Vienna, Austria BBU Université Libre de Bruxelles, Belgium CaBU University of California, Berkeley, California, USA CaSdU University of California, San Diego, California, USA CPT California Institute of Technology, Pasadena, California, USA DkKoRA Rigsarkivet, Copenhagen, Denmark DkKoNBA Niels Bohr Archive, Copenhagen, Denmark DLC Library of Congress, Washington, District of Columbia, USA FrPBN Bibliothèque nationale de France, Paris, France FrPGV Gauthier-Villars Archive, Paris, France FrPCF Collège de France, Archives, Paris, France Gy-Ar Deutsches Bundesarchiv, Koblenz, Germany GyB Staatsbibliothek zu Berlin, Preußischer Kulturbesitz, Berlin, Germany GyBAr(B) Deutsches Bundesarchiv, Berlin, Germany GyBAW Archiv der Berlin-Brandenburgischen Akademie der Wissenschaften, Berlin, Germany GyBHU Archiv der Humboldt Universität zu Berlin, Berlin, Germany GyBMPIW Archiv der Max-Planck-Institut für Wissenschaftsgeschichte, Berlin, Germany GyBP Archiv zur Geschichte der Max-Planck-Gesellschaft, Berlin, Germany