Columbia subject headings:
Panama--Emigration and immigration--Statistics--Periodicals.
Visitors, Foreign--Panama--Statistics--Periodicals.
Harvard subject headings:
Panama--Emigration and immigration--Statistics--Periodicals.
Visitors, Foreign--Panama--Statistics--Periodicals.
Princeton subject headings:
Panama--Emigration and immigration--Statistics--Periodicals.
Visitors, Foreign--Panama--Statistics--Periodicals.