Columbia subject headings:
Russia--History--Chronology.
Russia--History--Philosophy.
Russians--Origin.
Soviet Union--History--Chronology.
Soviet Union--History--Philosophy.
Harvard subject headings:
Russia--History--Chronology.
Russia--History--Philosophy.
Russians--Origin.
Soviet Union--History--Chronology.
Soviet Union--History--Philosophy.
Princeton subject headings:
Russia--History--Chronology.
Russia--History--Philosophy.
Russians--Origin.
Soviet Union--History--Chronology.
Soviet Union--History--Philosophy.