This is not new information for the Impossible Landscapes campaign. It's a re-organisation of the timeline found in the 'King in History' chapter, grouped mainly by NPCs, but also occasionally groups, locations, books, or other objects.

How is this useful? When players go down a corner of research or enquiry, especially if it's off the beaten path, you can turn to the object of inquiry and have a detailed summary of what they could find. This WILL happen, and while you could put together a document like this yourself, at $5 it's certainly worth paying for the labour.

My only criticism is that many of the table of contents are linked wrong, taking you a few pages off where you want to be. While I've gotten used to re-orientating myself because I know my alphabetical order, this is a major flaw in a product designed for spur-of-the-moment reference. I really hope this gets fixed and I'll amend my review when that happens.