Columbia subject headings:
Harvard subject headings:
Switzerland--History--Perpetual League, 1291--Congresses.
Valais (Switzerland)--History--Congresses.
Walsers--Italy--History--Congresses.
Walsers--Switzerland--History--Congresses.
Princeton subject headings:
Alps Region--History--Congresses.
Switzerland--Politics and government--1032-1499--Congresses.