FAA's Civil Aerospace Medical Institute (CAMI) - The "medical certification, research, education, and occupational health wing of the FAA's Office of Aerospace Medicine."
The "principal organization within the FAA with respect to aircraft accident investigation and all activities related to the National Transportation Safety Board (NTSB)."
Airplane Flying Handbook by 
Instrument Flying Handbook by 
Advanced Avionics - Faa-H-8083-6 by 
Pilot's Handbook of Aeronautical Knowledge by 