Copyright© 1999, Douglas Alberg
Sikorsky Ilya Muromets - first four-engined bomber
Sukhoi Su-15, Su-11, & Su-9
Su-25 "Frogfoot" attack aircraft & Tu-144 supersonic airliner
Sukhoi S-26 (Su-7 w/skis)
Tupolev Tu-114 & An-22