I'm all for short-but-informative books* , but twenty pages is a booklet. It would be a good size for a chapter in a book on web tools or particularly good Ruby

I'm all for short-but-informative books* , but twenty pages is a booklet. It would be a good size for a chapter in a book on web tools or particularly good Ruby libraries, though. * Such as seemingly everything Brian Kernighan has co-written.