is a complete guide to the city of Arkham and the neighboring towns of Dunwich, Innsmouth and Kingsport, detailing 115 fabled locations and featuring more than 500 illustrations.
Appears to be new and a companion to the Arkham Horror board-game, but may also be of interest to Mythos writers. There no hint that it’s a politically-tweaked and polished-up reprint of an older book, as often appears to be the case with Chaosium. I assume there must be maps, but they’re not specified in the description.
Free to read online as a flipbook, so you can see what it looks like inside. Though… my browser couldn’t get past the flipbook’s cookies blocking-notice.