Columbia subject headings:
Architecture--Portugal--Lisbon--Guidebooks.
Lisbon (Portugal)--Buildings, structures, etc.--Guidebooks.
Harvard subject headings:
Architecture--Portugal--Lisbon--Guidebooks.
Lisbon (Portugal)--Buildings, structures, etc.
Lisbon (Portugal)--Guidebooks.
Lisbon (Portugal)--Maps.
Princeton subject headings:
Architecture--Portugal--Lisbon--Guidebooks.
Lisbon (Portugal)--Buildings, structures, etc.--Guidebooks.