Columbia subject headings:
Earthquakes--Portugal--Lisbon--Early works to 1800.
Lisbon Earthquake, Portugal, 1755.
Portugal--Politics and government--1750-1777.
Harvard subject headings:
Earthquakes--Portugal--Lisbon.
Lisbon (Portugal)--History.
Portugal--Politics and government--1750-1777.
Princeton subject headings:
Earthquakes--Portugal--Lisbon.
Portugal--Politics and government--1750-1777.