Unless otherwise specified, all original documents presented or cited in this vol- ume, as well as cited books from Einstein’s personal library or items from his col- lection 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: AVPA Phonogrammarchiv der Österreichischen Akademie der Wissenschaften, Vienna, Austria Br-SpSBI Acervo do Centro Histórico da Sociedade Beneficente Israelita Brasileira Albert Einstein, São Paulo, Brazil CaPsCA Institute Archives, California Institute of Technology, Pasadena, California, USA CaSdU University of California, San Diego, USA CtY-BR Yale University, Beinecke Rare Book and Manuscript Library, New Haven, Connecticut, USA DkKoRA Rigsarkivet, Copenhagen, Denmark DS Smithsonian Institution Libraries, Washington, D.C., USA FrPBN Bibliothèque nationale de France, Paris, France FrPCF Collège de France, Archives, Paris, France FrPESPCI Ecole Supérieure de Physique et de Chimie Industrielle, Paris, France GyB Staatsbibliothek zu Berlin, Preußischer Kulturbesitz, Berlin, Germany GyBAW Archiv der Berlin-Brandenburgischen Akademie der Wissenschaften, Berlin, Germany GyBHU Archiv der Humboldt Universität zu Berlin, Germany GyBMPG Archiv zur Geschichte der Max-Planck-Gesellschaft, Berlin, Germany GyBMPIW Archiv des Max-Planck-Instituts für Wissenschaftsgeschichte, Berlin, Germany LOCATION SYMBOLS