For those who want to know more about the role of BuAer and the Naval Aircraft Factory in the design, procurement and production of U.S. Navy aircraft, airships and engines, esp. in the 1920s and 1930s, I recommend Dr William F. Trimble's "Wings for the Navy, a History of the Naval Aircraft Factory, 1917-1956" (USNI Press, 1990). Dr Trimble is a history faculty member at Auburn University. I might also add that the papers of aero historian Richard K. Smith (see above), including some unpublished manuscripts (among them a major study on the history of aerial refueling) have been acquired by the Auburn Univ. Library.