GM Nick de Firmian and his team have just published
Modern Chess Openings, 15th edition.
MCO is a one-volume reference book covering ALL chess openings. It has been the standard English language work on openings for more than a century.The previous edition, MCO-14, was written almost a decade ago, in 1999.MCO-15 has been completely revised and updated, often with the help of computer chess programs, and reflects the latest changes in opening theory.This is a truely a whale of a book: it has no less than 748(!) pages. Yet its price is modest at only ?¢‚Äö¬¨ 24.95.Larry Christiansen thinks MC-15 is "a must for every tournament player". Please have a look
here.