CIERVA AUTOGIROS: The Development of Rotary-Wing Flight.

8vo., blue clothbound hardback gilt, with unclipped dust jacket; 384pp, indexed, illustrated throughout with b/w plates and diagrams. Previous owner's stamped details to corner of front pastedown and a bookshop's small sticket to foot. Dust jacket a little edgeworn, light creasing to upper cover, spine slightly faded, otherwise VG/VG.