Biplanes over the Western Front of World War I, circa 1917 (Frank Hurley)
World War I airplane
Biplanes over the Western Front of World War I, circa 1917 (Frank Hurley)
Biplanes over the Western Front of World War I, circa 1917 (Frank Hurley)
Biplanes over the Western Front of World War I, circa 1917 (Frank Hurley)
