Columbia subject headings:
Agriculture and politics--Venezuela--Zulia--History.
Agriculture--Economic aspects--Venezuela--Zulia.
Sugar crops.
Zulia (Venezuela)
Harvard subject headings:
Agriculture and politics--Venezuela--Zulia--History.
Agriculture--Economic aspects--Venezuela--Zulia.
Sugar crops.
Zulia (Venezuela)
Princeton subject headings:
Sugar trade--Venezuela--Zulia--History--19th century.
Sugar trade--Venezuela--Zulia--History--20th century.
Sugarcane industry--Venezuela--Zulia--History--19th century.
Sugarcane industry--Venezuela--Zulia--History--20th century.