Columbia subject headings:
Historiography--Soviet Union--Congresses.
Historiography--United States--Congresses.
History--Mathematical models--Congresses.
Harvard subject headings:
Historiography--Soviet Union--Congresses.
Historiography--United States--Congresses.
History--Mathematical models--Congresses.
Princeton subject headings:
Historiography--Soviet Union--Congresses.
Historiography--United States--Congresses.