blue book
1. adjective (usually hyphenated) Of or pertaining to a compendium or almanac of statistics and detailed information, as of people, consumer goods, property, etc. You should always check the blue-book value of a home before you purchase from an independent seller.
2. noun A compendium or almanac of statistics or detailed information, as of people, consumer goods, property, etc. The government's blue book lists everyone employed at a federal level. I always check the blue book before making any major purchases.