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Schneider, Dieter; Rickenbacher, Martin; Degen, Hans R.; Ebneter, Hans-Anton; Klöti, Thomas; Koller, Guido; Wullschleger, Rudolf (July 2007). Ferdinand Rudolf Hassler (1770-1843) - Swiss Pioneer for U.S. Surveying, Mapping and Standards (Unpublished). In: 22nd International Conference on the History of Cartography, Berne. Berne. 08-13.07.2007.
