Columbia subject headings:
Harvard subject headings:
Lisbon (Portugal)--Civilization--20th century--Congresses.
Lisbon (Portugal)--Intellectual life--20th century--Congresses.
Lisbon (Portugal)--Social life and customs--20th century--Congresses.
Princeton subject headings:
Lisbon (Portugal)--Civilization--20th century--Congresses.
Lisbon (Portugal)--Intellectual life--20th century--Congresses.
Lisbon (Portugal)--Social life and customs--20th century--Congresses.