[1]. Dallas Airplane College, Inc. [promotional flyer]
[2]. [Letter from college president Henry Edward Byrne to Olen Yates, dated Jan. 20, 1941]
[3]. Dallas Airplane School, Inc., Dallas, Texas, confidential qualification record
[4]. [Original mailing envelope from the college, addressed to Mr. Olen Yates of Joinerville, Texas, and postmarked 1941].