A nice thick volume, original period piece, entitled "Technical Manual of Air Navigation". Stamped with a name on the front 'A/C O. R. Hartman Jr.'. There is a further name pencilled inside the front page 'Lt. J. R. Russo', together with what I assume is a class number, 1944 date. The manual itself is dated 1941. 296 pages.
Slight separation of side inside front cover (see pictures).