Columbia subject headings:
Russia--History--Errors, inventions, etc.
Russia--History--Nicholas II, 1894-1917.
Harvard subject headings:
Russia--History--Errors, inventions, etc.
Russia--History--Nicholas II, 1894-1917.
Princeton subject headings:
Russia--History--Errors, inventions, etc.
Russia--History--Nicholas II, 1894-1917.