Online Books For Pilots

From FlightSim

FAA Online Books:

Student Pilot Guide

AIM, or Aeronautical Information Manual

Pilot's Handbook Of Aeronautical Knowledge

Airplane Flying Handbook

FAA Air Navigation

Instrument Flying Handbook

Instrument Procedures Handbook

AOPA's special Page for MS Flight Simulator folks

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Not a book, but an excellent tutorial on navigation:

Flight Simulator Navigation (a tutorial)