It doesn't exist. Entitled "Exploring Lost Worlds", the author is indisciperable, searching on the internet turns up nothing but other types of "lost worlds" books by known and unknown authors, but nothing from this particular book. Most likely non-existent, a mere PROP for the movie.
Plus when we see the cover of the book, is says "Exploring: Lost Worlds" by Maggie K..., but latter, when we see the page of the book, it's some of Frederick Forsyth latter novels (probably The Fox)