not bad to have a base, it brings clarification on a number of opportunities available in the game, but it is both incomplete, the missing element (ability to recover weapons in the plane that crashed into Lake north as small example), there have no real interesting elements, all that is in it is discoverable simply by playing, and more info can be found on the net that in the book. But despite the 2 (the book and Internet) remain mysteries ... I pass on typographical errors ...