Here offered is an amazing book that covers the Siegerland and Westerwald Mining Districts that span several German states.  At over 800 pages, this is a massive book with hundreds of color photos of the minerals as well as photos of historic labels, historic photos of the mines and miners that produced these amazing and rare minerals, historic photos of the areas surrounding the mines and much more  Even though the book is in German, one can use a phone with google translate to rather easily translate sections.  Of course a picture says a thousand words so anyone can appreciate the massive amount of effort that went into this book.  The book is in excellent condition with no tears, rips or staining!  It has mostly sat unused on my shelf all these years.  A friend acquired me this book used because the publisher sold out and as far as I'm aware, it is out of print still!  This is a top-notch resource for this mineral-rich area and is the go-to for anyone that wants to learn more about the minerals from this area of Germany.