This 27-Chapter, 1" thick manual carries the date of 1 Aug 1968. This is an excellent manual on all the basics of air navigation including dead reckoning, celestial, LORAN, radar nav, low-level, etc. Profusely illustrated. Excellent condition in the original blue vinyl binder with screw-post fasteners. This is a classic manual used by all pilots and navigators in Vietnam-era flight schools.