Columbia subject headings:
Aeronautics--Russia--History.
Air pilots, Military--Russia--Biography.
Tkachev, V. M.
World War, 1914-1918--Aerial operations.
Harvard subject headings:
Aeronautics--Russia--History.
Air pilots, Military--Russia--Biography.
Tkachev, V. M.
World War, 1914-1918--Aerial operations
Princeton subject headings:
Aeronautics--Russia--History.
Air pilots, Military--Russia--Biography.
Tkachev, V. M.
World War, 1914-1918--Aerial operations.