Columbia subject headings:
Harvard subject headings:
Income--Venezuela--Zulia--Statistics--Periodicals.
Labor supply--Venezuela--Zulia--Statistics--Periodicals.
Unemployed--Venezuela--Zulia--Statistics--Periodicals.
Zulia (Venezuela)--Population--Statistics--Periodicals.
Princeton subject headings:
Income--Venezuela--Zulia--Statistics--Periodicals.
Labor supply--Venezuela--Zulia--Statistics--Periodicals.
Unemployed--Venezuela--Zulia--Statistics--Periodicals.
Zulia (Venezuela)--Population--Statistics--Periodicals.