Washington, Aerospace Education Foundation, 1982. Hap Arnold, pp 25-31. Book call no. Committee on Military Affairs. Washington, GPO, 1945.
Book call no.
355 U58d The War Reports of General of the Army George C. Marshall. General of the Army H.H. Arnold. Philadelphia, Lippincott, 1947. Book call no. 940.5373 W25 Webster's American Military Biographies .