Burls, G.A. AERO ENGINES: with a General Introductory Account of the theory of the Internal-Combustion Engine. London, Charles Griffin & Co., 1915. 204 pages, tables, photos and folding plates of famous aero engines such as Anzani, Salmson, Wolseley, Panhard, Gnome, etc. 8vo (6.5x9"), blue cloth covers, 2nd edition. A rare volume with comprehensive coverage of most of the early aero engines. Good, cover edges worn, contents very good.