The original documents are located in theWissenschaftshistorischen Sammlungen of the ETH-Bibliothek, the printed maps and books in many different libraries, especially the ETH-Bibliothek and the Zentralbibliothek Zurich. In all of these libraries the documents can be checked out under the conditions applying or they can be consulted in the reading room. For opening hours please refer to the homepages of the ETH-Bibliothek Zurich and the Zentralbibliothek Zurich zu entnehmen.