Revised 1 May, 1945.
AAF Manual No. 50-12.
"Published for Headquarters, AAF, Office of Assistant Chief of Air Staff, Training by Headquarters, AAF, Office of Flying Safety" according to title page.
Document no. D-3910. Issue no. 22. Issued on March 21, 1945.
Boeing contract no. NXsa 16848.
"Manufactured by the Boeing Aircraft Company for the United States Navy under contract NXsa 16848."