Correspondence in subject [X]
Air racing in subject [X]
Yeager, William F., 1915-1990 in subject [X]
World War, 1939-1945 - - Aerial Operations, American in subject [X]
Airplane racing in subject [X]
Aircraft in subject [X]
Training manuals in subject [X]
Pilot in subject [X]
Negatives in subject [X]