The United States Air Force . New York, Praeger, 1967. World War I, pp 15-19. The Air Service During World War I, pp 19-24. The Air Service Between the Wars, pp 25-30.
Book call no.
The Story of the United States Strategic Bombing Survey . New York, Garland Pub, 1976. Book call no. The Great Attack on St. Mihiel, pp 234-248. Nothing like this had ever been tried before.