Topographic Atlas of Switzerland
The Topographic Atlas of Switzerland (German: Topographischer Atlas der Schweiz), also known as the Siegfried Atlas or Siegfried Map (German: Siegfriedkarte; French: Carte Siegfried), is an official map series of Switzerland. Its publication was begun by the Federal Topographic Bureau under Hermann Siegfried, and continued from 1870 to 1926.
Source: Wikipedia — Topographic Atlas of Switzerland (CC BY-SA 4.0)