Columbia subject headings:
Agriculture--Venezuela--Portuguesa--History--20th century.
Portuguesa (Venezuela)--Commerce--History--20th century.
Portuguesa (Venezuela)--Economic conditions.
Harvard subject headings:
Agriculture--Venezuela--Portuguesa--History--20th century.
Portuguesa (Venezuela)--Commerce--History--20th century.
Portuguesa (Venezuela)--Economic conditions.
Princeton subject headings:
Agriculture--Venezuela--Portuguesa--History--20th century.
Portuguesa (Venezuela)--Commerce--History--20th century.
Portuguesa (Venezuela)--Economic conditions.