Columbia subject headings:
Harvard subject headings:
Aeronautics, Military--Research--United States--History.
Airplanes, Military--United States--History
Area 51 (Nev.)--History.
Cold War
Military bases--Nevada--History.
Military research--United States--History.
Research aircraft--United States--History.
U-2 (Reconnaissance aircraft)--History.
United States. Central Intelligence Agency
Princeton subject headings:
Aeronautics, Military--Research--United States--History.
Airplanes, Military--United States--History.
Area 51 (Nev.)--History.
Cold War.
Lincoln County (Nev.)--History--20th century.
Military bases--Nevada--History.
Military research--United States--History.
Research aircraft--United States--History.
U-2 (Reconnaissance aircraft)--History.
United States--History, Military--20th century.
United States. Central Intelligence Agency