Unless otherwise specified, all original documents presented or cited in this volume, as well as cited books from Einstein’s personal library or items from his collection of reprints and musical scores, are located at the Albert Einstein Archives at The Hebrew University, Jerusalem. The following is a list of repositories cited: AVU Archiv der Universität Wien, Vienna, Austria CoDU University of Denver, Penrose Library, Colorado, USA DkKoRA Rigsarkivet, Copenhagen, Denmark DLC Library of Congress, Washington D. C., USA Gy-Ar Deutsches Bundesarchiv, Koblenz, Germany GyB Staatsbibliothek zu Berlin, Preußischer Kulturbesitz,  Berlin, Germany GyBAK Archiv der Akademie der Künste, Berlin, Germany GyBoASD Archiv der sozialen Demokratie, Friedrich-Ebert-Stiftung, Bonn, Germany GyBPAAA Politisches Archiv des Auswärtigen Amts, Berlin, Germany GyBSA Geheimes Staatsarchiv, Preußischer Kulturbesitz, Berlin (Dahlem), Germany GyMBSA Bayerisches Hauptstaatsarchiv, Munich, Germany GyMüULB Universitäts- und Landesbibliothek Münster, Germany GySpPLB Pfälzische Landesbibliothek, Speyer, Germany GyU-Ar Stadtarchiv Ulm, Ulm, Germany IL-JeCAH Central Archives for the History of the Jewish People, Jerusalem, Israel IL-JeCZA Central Zionist Archives, Jerusalem, Israel IL-JeHUCA Hebrew University Archives, Jerusalem, Israel IL-RWW Weizmann Archives, Weizmann Institute of Science, Rehovoth, Israel InLL Lilly Library, Indiana University, Bloomington, Indiana, USA MBU Mugar Library, Boston University, Massachusetts, USA MDNLM National Library of Medicine, National Institutes of Health, Bethesda, Maryland, USA MWalB Brandeis University Archives, Waltham, Massachusetts, USA NL-LeRM Museum Boerhaave (Rijksmuseum voor de Geschiedenis van de Natuurwetenschappen en van de Geneeskunde), Leyden,  The Netherlands LOCATION SYMBOLS