Gnome Mono Instruction Book, No. 2, for the 100hp Monosoupape 9 cylinder type B2, published by Gnome and Le Rhone Engine Co. with fold-out diagrams, numerous diagrams and photographs within the text (slight scuffing to spine); Le Maitre, W: Natural Stability in Aeroplanes, 1911; Thurston, A.P: Elementary Aeronautics, 1911 and Hubbard, T. Ledeboer, G.H. and Turner, C.C: The Aeroplane 1911 (4)