Columbia subject headings:
Social participation--Congresses.
Youth--Political activity--Congresses.
Youth--Social conditions--Congresses.
Harvard subject headings:
Social participation--Congresses.
Youth--Political activity--Congresses.
Youth--Social conditions--Congresses.
Princeton subject headings:
Social participation--Congresses.
Youth--Political activity--Congresses.
Youth--Social conditions--Congresses.