I'd just like too add a few more cheaps books to the ones I listed above
FAA aviation weather..for folks flying in the US ---Aviation weather services
Buck's Weather Flying... Taylor's Instrument Flying..Langwiesche's Stick and Rudder...Webb's Fly the Wing...Mike Goulian's and Geza Sourvizoy's basic and advanced aerobatics... Mallinson and Wollard's Handbook of Glider Aerobatics...good stuff for airplane pilots too
For those who aren't engineers but are interested in aerodynamics H.H Hurt's Aerodynamics for Naval Aviators
For those going to jets of course DP Davies Handling the Big Jets listed earlier
in addition to the book I
if you bought them all they's probably set you back about 300$ or so
I wouldn't recomnend pilots read any of my engineering aerodynamics books though...
...seriously!!!