Columbia subject headings:
Harvard subject headings:
Europe, Central--History--20th century--Congresses.
Europe, Eastern--History--1918-1945--Congresses.
Violence--Europe, Central--History--Congresses.
Violence--Europe, Eastern--History--Congresses.
Princeton subject headings:
Civil war--Europe, Central--History--20th century.
Civil war--Europe, Eastern--History--20th century.
Europe, Central--History--20th century.
Europe, Eastern--History--20th century.
Political violence--Europe, Central--20th century.
Political violence--Europe, Eastern--20th century.