Columbia subject headings:
Cities and towns--Europe.
Cities and towns--Portugal.
Europe--Emigration and immigration.
Migration, Internal--Europe.
Migration, Internal--Portugal.
Portugal--Emigration and immigration.
Rural-urban migration--Europe.
Rural-urban migration--Portugal.
Harvard subject headings:
Human geography--European Union countries.
Population geography--Europe.
Population geography--Portugal--Lisbon.
Sociology, Urban--European Union countries.
Urbanization--European Union countries.
Princeton subject headings:
Population geography--Europe.
Population geography--Portugal--Lisbon.