Columbia subject headings:
Panslavism--Congresses--History--19th century.
Panslavism--Congresses--History--20th century.
Harvard subject headings:
Panslavism--Congresses--History--19th century.
Panslavism--Congresses--History--20th century.
Princeton subject headings:
Panslavism--Congresses--History--19th century.
Panslavism--Congresses--History--20th century.