Columbia subject headings:
Historians--Ukraine--Congresses.
Kostomarov, N. I. (Nikolaĭ Ivanovich), 1817-1885--Congresses.
Russia--Historiography--Congresses.
Ukraine--Historiography--Congresses.
Harvard subject headings:
Princeton subject headings:
Historians--Russia--Biography--Congresses.
Historians--Ukraine--Biography--Congresses.
Kostomarov, N. I. (Nikolaĭ Ivanovich), 1817-1885--Congresses.
Russia--Historiography--Congresses.
Ukraine--Historiography--Congresses.