Columbia subject headings:
Harvard subject headings:
Germany--Politics and government--1945-1990--Congresses
Protest movements--Social aspects--Germany--Congresses.
Social movements--Germany--Congresses.
Students--Germany--Political activity--Congresses.
Youth movements--Germany--Congresses.
Princeton subject headings:
Nineteen sixty-eight, A.D.--Social aspects.
Social change.
Social history--1970-