Original "Handbook - The Curtiss Standard Model V-2 Aeronautical Motor". Buffalo, Curtiss Aeroplane and Motor Corp., 1917. 30pp, illus, wrps, 5x7.5". Likely one of the worst I have encountered, condition wise...but this is how I like them! Clearly well used with a cloth spine repair, cover stains and chips. I bet it's right out of the WWI mechanic's coverall pocket.