It sounds like you are referring to the Star Wars Encyclopedia, but the cover is a bit different than you described. If you want a book with the most amount of Star Wars information, you want The Complete Star Wars Encyclopedia. It's a 3 volume update of the original book and contains just about everything from 1977 to 2008. Fair warning: large sections of these books are no longer canon as of 2014. If you are looking for an exhaustively extensive source of all things Star Wars, be it Legends (old EU) or current canon, check out Wookieepedia.