Columbia subject headings:
Saint Petersburg (Russia)--History--Revolution, 1917-1921.
Soviet Union--History--Revolution, 1917-1921.
Harvard subject headings:
Russia--History--February Revolution, 1917.
Saint Petersburg (Russia)--History--1917-1921.
Soviet Union--History--Revolution, 1917-1921.
Working class--Russia (Federation)--Saint Petersburg
Princeton subject headings:
Saint Petersburg (Russia)--History--1917-1921.
Soviet Union--History--Revolution, 1917-1921.