Up for sale is Great Courses The World’s Greatest Geological Wonders plus Course Guidebook. There are 6 DVDs and the study book in very good condition. We are not professional book/CD/DVD retailers, but a group of volunteers that help with book, CD, DVD and video game donations. All proceeds from this item go to a 501c3 non-profit group that supports our local town library with programming for all ages, materials for these programs and museum and learning venues passes.