Manual dated March 4, 1948 (replacing an earlier version dated 10/15/47), plus revisions dated April 30, 1948 and October 1, 1948.
Publication number AN 01-5EUA-1.
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.