"Henri Dufour" . . . . "Federal Office of Topography" . "(1817\u20131875)" . . . . . . . "1875" . . . . . . "Guillaume-Henri Dufour" . . . . . . . . . . . . . . . . . "1875" . . . "Dufour" . . . . . . . . . "Guillaume Henri Dufour" . . . "1787" . "Guillaume Henri Dufour" . . . . "Swiss Army" . . "(1810\u20131815)" . . . . . "1810" .