Columbia subject headings:
Belarus--Historiography--Congresses.
Belarus--History--Congresses.
Ulashchik, N. N.--Congresses.
Harvard subject headings:
Belarus--Historiography--Congresses.
Belarus--History--Congresses.
Ulashchik, N. N.--Congresses.
Princeton subject headings:
Belarus--Historiography--Congresses.
Belarus--History--Congresses.
Ulashchik, N. N.--Congresses.