I had a wartime copy copy of AP1732a “ Instructors Handbook of Elementary Flying Training” when I first started instructing 34 years ago, so at the time it was only about forty years old. Most of the content was still relevant then, the AOPA syllabus lesson numbers were based on the RAF syllabus, and there is fundamentally no difference (except for take-off and landing) between teaching basic flying in a Tiger Moth and a Cessna 150. The most useful were the notes for instructors and common student errors at the end of each lesson, and If I remember correctly it covered the whole syllabus including basic I.F, night flying and aerobatics. Everything in it is available from other Instructor manuals, but as a handy ready reference for instructors and students it would still be of excellent value for basic flying instruction in simple aircraft.