Blériot-SPAD S.42 explained
The SPAD S.42 was a French biplane trainer aircraft of the early 1920s, developed by Société Pour L'Aviation et ses Dérivés (SPAD) from prolific SPAD S.XIII fighter.
Bibliography
- Andersson. Lennart. Histoire de l'aéronautique persane, 1921–1941: La première aviation du Chah d'Iran . Avions: Toute l'aéronautique et son histoire . July 1998 . 76 . 2–12 . History of the Persian Air Force, 1921–1941: The First Aircraft of the Shah of Iran . French . 1243-8650.