New book on Genna Zinc Smelter slags

Today I received the brandnew photo- and reference book on the minerals of the former Genna Zinc smelter near Letmathe/Iserlohn in Germany. I have quite a collection from there, and the book gives me the opportunity to do a thorough review of the samples I have. Thanks to the authors Ulrich Wagner and Bernd Döhnel, who sent me a signed copy