Columbia subject headings:
Europe--Description and travel--Congresses.
Europe--Description and travel--Early works to 1800--Congresses.
Travelers--Europe--Biography--Congresses.
Voyages and travels--Congresses.
Harvard subject headings:
Travelers--Europe--Biography--Congresses.
Voyages and travels--Congresses.
Princeton subject headings:
Travelers--Europe--Biography--Congresses.
Voyages and travels--Congresses.