Columbia subject headings:
Aeronautics, Military--Mexico.
Aeronautics, Military--Texas--Big Bend Region.
Big Bend Region (Tex.)--History, Military.
Johnson, Elmo.
Mexico--History--Revolution, 1910-1920.
Mexico. Fuerza Aérea Mexicana--History.
Smithers, W. D. (Wilfred Dudley), 1895-1981.
United States. Air Force--History.
Harvard subject headings:
Princeton subject headings:
Aeronautics, Military--Mexico.
Aeronautics, Military--Texas--Big Bend Region.
Big Bend Region (Tex.)--History, Military.
Johnson, Elmo.
Mexican-American Border Region--History.
Mexico. Fuerza Aérea Mexicana--History.
Smithers, W. D. (Wilfred Dudley), 1895-1981.
United States. Air Force--History.