Rufus Stone has announced that the signature edition of the California Jam photo book will now come with four autographs: by Jon Lord, David Coverdale, Glenn Hughes and Ian Paice. The signature edition is limited to 350 copies and costs £300 + shipping. Preorders are being accepted at the publisher’s site. The book will ship in December 2012. The is also the vinyl edition (at £200), and the standard edition (at £120).