The Star Trek Chronology is a very useful Star Trek reference book. It's basically just a timeline for The Star Trek Universe.
The 1993 publication only has stuff up to TNG season 5 since that's all there was when it was written but it's still very cool and useful.
The 1996 publication that contains stuff from Star Trek VIII: First Contact, DS9 seasons 1-4 and Voyager season 1-2.
They both have some spelling errors such as spelling Zephram Cochrane "Zefram" and Khan Noonian Singh "Khan Noonien Singh" (IMDB does this too). It also spells Geordi LaForge as Geordi La Forge, but so does part of the official Star Trek website (startrek.com)