Columbia subject headings:
Harvard subject headings:
509th Army Air Field (N.M.)
Defense information, Classified--United States.
Official secrets--United States.
Roswell (N.M.)--History.
Unidentified flying objects--Sightings and encounters--New Mexico--Roswell
Princeton subject headings:
509th Army Air Field (N.M.)
Defense information, Classified--United States.
Official secrets--United States.
Roswell (N.M.)--History.
Unidentified flying objects--Sightings and encounters--New Mexico--Roswell.