Columbia subject headings:
Algarve (Portugal)--Economic conditions--20th century.
Industries--Portugal--Algarve.
Labor--Portugal--Algarve.
Working class--Portugal--Algarve.
Harvard subject headings:
Algarve (Portugal)--Economic conditions--20th century.
Industries--Portugal--Algarve.
Labor--Portugal--Algarve.
Working class--Portugal--Algarve.
Princeton subject headings: