Hi Leigh, I read that book even before it was published, but I do have the one you are referencing in both print from 1999 Touchstone 0-684-86006-6 and also the 11/1999 "Advance Uncorrected Reader's Proof from Simon & Schuster" 0-684-86005-8.
The Longs have written an excellent book here. However, we now know since those 11 years have passed since the writing, that two organizations have performed the search at 17,000 feet beyond the 2000 square mile area of uncertainty that the Longs predicted the plane would be at on pages 246 and 247.
We also know that General Nimitz and several eyewitnesses have independently accounted for Amelia on the Marshall Islands.
See here:
http://www.ameliaearhartmovie.com/