Columbia subject headings:
Russia--Emigration and immigration--History.
Russians--Foreign countries--History.
Soviet Union--Emigration and immigration--History.
Harvard subject headings:
Russia--Emigration and immigration--History.
Russians--Foreign countries--History.
Soviet Union--Emigration and immigration--History.
Princeton subject headings:
Russia--Emigration and immigration--History.
Russians--Foreign countries--History.
Soviet Union--Emigration and immigration--History.