Stapfer. Operational history and development of Russia's IL-4 bomber, reconnaissance, and torpedo aircraft.  Includes the DB-3S, DB-3B, DB-3T, DB-3TP, DB-3T (Experimental), Capsule DB-3, TsKB-30, DB-3M, TsKB-30 N-1, DB-3F, DB-3F, IL-4, IL-4TK, and IL-6 variants. Also covers the DB-3F in German and IL-4 in Finnish service, Approximately 90 photos, b/w line drawings, 10 color profiles; 50 pages.