I just received this book in the mail. I love it. It has a great overview of the history and importance of handknit mittens in Latvian history. It also includes several Latvian poems about mitten knitting, which I thought was fantastic.
There are several full length patterns in the book that explain the different techniques used to create the mittens in the book, but then there are many, many more charts in the back of the book, as well as color photographs of finished mittens corresponding to the charts. I don't think this is a great book if you are a very beginning knitter, but I do think that if you've learned how to knit, purl, increase and decrease and done a stranded color project, you should do fine with this book. As another reviewer said, you have to piece together the techniques from other sections of the book to make any of the charts in the back, but really, it's not that hard, and the instructions are clear.
My only criticism of the book is that the charts themselves are in black and white and a little crowded together. Otherwise, I found this book to be well worth the money I spent, and I plan to make lots of the mittens found in it, as well as probably mixing and matching to make my own, unique, mittens.