Columbia subject headings:
Harvard subject headings:
Agriculture--Economic aspects--Portugal--Leiria (District)--History.
Industries--Portugal--Leiria (District)--History.
Leiria (Portugal : District)--Economic conditions.
Princeton subject headings:
Agriculture--Economic aspects--Portugal--Leiria (District)--History.
Industries--Portugal--Leiria (District)--History.
Leiria (Portugal : District)--Economic conditions.