Books teach abilities and specializations rather than single crafts; many are tiny-supply world drops with some of the most erratic charts in the catalog.
Book (Recipe)
Auction-house prices and price history for Book in TBC Classic.
55 items in Recipes › Book are currently auctionable in Burning Crusade Classic.
Prices refresh hourly from TradeSkillMaster (TSM).
Book listings link to price-history pages with per-realm buyout, average, and median data for Burning Crusade Classic.