Columbia subject headings:
Harvard subject headings:
Birkenfeld (Germany : Landkreis)--History--20th century.
Birkenfeld (Germany : Landkreis)--Social conditions--20th century.
Nineteen sixty-eight, A.D.
Protest movements--Germany--Birkenfeld (Landkreis)--History--20th century.
Princeton subject headings:
Birkenfeld (Germany : Landkreis)--Social conditions--20th century.
Protest movements--Germany--Birkenfeld (Landkreis)--History--20th century.
Social change--Germany--Birkenfeld (Landkreis)--History--20th century.
Social movements--Germany--Birkenfeld (Landkreis)--History--20th century.