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.