Columbia subject headings:
Children--Greece--History--Congresses.
Children--History--Congresses.
Youth--Greece--History--Congresses.
Youth--History--Congresses.
Harvard subject headings:
Children--Greece--History--Congresses.
Children--History--Congresses.
Youth--Greece--History--Congresses.
Youth--History--Congresses.
Princeton subject headings:
Children--Greece--History--Congresses.
Children--History--Congresses.
Youth--Greece--History--Congresses.
Youth--History--Congresses.