L O C A T I O N S Y M B O L S x c i i i SzBSF Albert-Einstein-Stiftung, Max Flückiger, Bern, Switzerland SzGeB Besso Family Trust, Geneva, Switzerland SzGeBNU Bibliothèque des Nations Unies, Geneva, Switzerland SzZuETH Eidgenössische Technische Hochschule, Zurich, Switzerland SzZuSa Staatsarchiv des Kantons Zürich, Zurich, Switzerland SzZuZB Zentralbibliothek, Zurich, Switzerland TxU-Hu Harry Ransom Humanities Research Center, University of Texas at Austin, Austin, Texas, USA UkCF Fitzwilliam Museum, Cambridge, England, UK UkE National Library of Scotland, Edinburgh, Scotland, UK