Columbia subject headings:
Alps, Eastern--History--Congresses.
Christian pilgrims and pilgrimages--Switzerland--Alps, Swiss--Congresses.
Mountain passes--Switzerland--Alps, Swiss--Congresses.
Harvard subject headings:
Alps, Eastern--History--Congresses.
Christian pilgrims and pilgrimages--Switzerland--Alps, Swiss--Congresses.
Mountain passes--Switzerland--Alps, Swiss--Congresses.
Princeton subject headings:
Alps, Eastern--History--Congresses.
Christian pilgrims and pilgrimages--Switzerland--Alps, Swiss--Congresses.
Mountain passes--Switzerland--Alps, Swiss--Congresses.