After no small amount of wrangling, bank visits and correspondence with Mr. Wolf, my copy of his second volume arrived yesterday. A follow-up from his first volume which dealt with Jaeger hunting rifles, this book goes further back, showcasing incredible artistry of matchlocks from the very early 1600s, wheelocks, snaphaunces and finally flintlocks. There are also a number of repeating firearms detailed, which are fascinating given the technology of the time. The text is in German, which increases the difficulty of understanding details, but if you take your time, you can make out broad themes.
Mike Gahagan also has a couple of his rifles shown ...
The production quality is excellent, from printing to the photos.
Overall, while very expensive, if you've an interest in the topic, it belongs on your bookshelf.
