When I first bought this book, I was already collecting most of the series mentioned (There is a of them on the front of the book). The first series mentioned was Ruth Fielding. Four formats were listed, of the five formats that exist. This was the first warning. All through the book, John Axe combined formats, or did not list them at all. Although it gives some nice eronious information (i.e. information about the stratmeyer synicate), most of the contents can be found after a two mininte search on Google. At one point, I emailed John Axe with a few Beverly Gray formats that he did not include in the guide. In his reply, he called them "anomalties", and compared them with some misprints that he owned. As of yet, I have not found a good guide, except ones for individual series. ...