Columbia subject headings:
Keller, Gottfried, 1819-1890.
Poland--History--Revolution, 1863-1864.
Poland--Relations--Switzerland.
Switzerland--Relations--Poland.
Harvard subject headings:
Keller, Gottfried, 1819-1890
Poland--History--Revolution, 1863-1864
Poland--Relations--Switzerland.
Switzerland--Relations--Poland.
Princeton subject headings:
Keller, Gottfried, 1819-1890.
Poland--History--Revolution, 1863-1864.
Poland--Relations (general) with Switzerland.
Switzerland--Relations (general) with Poland.