SCIENTIFIC AMERICAN, New York, June 20, 1914  Full front page duotone photo: " A Close Shave In The Air" shows two planes in a near mid-air collision. Report inside with 5 photos and a diagram: "The Langley Aeroplane Construction and Control Mechanism".
Complete in 16 pages, a small piece from the lower blank margin, several archival mends inside & several tears to margins. Light dirtiness to the ftpg. & a library stamp in an upper corner.