US Army Air Force
Navigators Information File, WWII
This is an original WWII-era Navigators Information File published in 1944 by the US Army Air Force. It is the basic reference book for aircraft navigators in the performance of their duties. See photos.
The page numbers are by section, so total pages are not estimated here. It is about 1/2 inch thick. All pages are intact as is the soft cover. Its hard to find another in better condition than this example.