Columbia subject headings:
Syria--Census--Congresses.
Syria--Economic conditions--Congresses.
Syria--Population--Congresses.
Syria--Social conditions--Congresses.
Harvard subject headings:
Syria--Census--Congresses.
Syria--Economic conditions--Congresses.
Syria--Population--Congresses.
Syria--Social conditions--Congresses.
Princeton subject headings:
Syria--Census--Congresses.
Syria--Economic conditions--Congresses.
Syria--Population--Congresses.
Syria--Social conditions--Congresses.