Columbia subject headings:
Harvard subject headings:
East Asia--Emigration and immigration--Congresses.
Europe--Emigration and immigration--Congresses.
Russians--East Asia--Congresses.
Russians--Europe--Congresses.
Russians--United States--Congresses.
United States--Emigration and immigration--Congresses.
Princeton subject headings:
Russia (Federation)--Emigration and immigration--Congresses.
Russia--Civilization--20th century--Congresses.
Russians--Foreign countries--Congresses.