I agreed with your review of the book Norwegian Volunteer of the Waffen SS. I am not sure why the publisher wanted to include German text but the additional text may have resulted the book in a very big size.
In fact one of the best section of the book was the explanation by the authors on the Skijaeger Kompanie, Polizei Schikompanie. When I first studied about the Norwegian Waffen SS units, my impression was that it was mostly Den Norske Legion as well as the Regiment Norge of the Wiking. With this book, the genesis and evolution of the units consisted mostly Norwegian Waffen SS volunteers were explained by the authors.
It's a very good photobook on Norwegian Waffen SS volunteers, probably the most definitive one in English/German language.