[ Autographs ] RUSSIAN WORLD WAR I AIRCRAFT BLUEPRINTS A nice grouping of two blueprints, each approx. 28in x 20in, in Russian, ca.1917 showing two types of aircraft. The first is a blimp showing the craft itself, two wicker cabins, ballast, and so on. The second blue shows a fixed-wing monoplane in a schematic side view and appears to be signed by the unidentified designer at bottom. Both bear heavy folds and slight soiling, overall good to very good.