This hard-cover book with a collapsible “fishbone-fold” interior depicts the tour routes in relation to the cave’s known length, at the time of my 2009 stay. (The cave's mapped length is now 400 miles.) I represented the "tiny fraction" that's viewable to the public through paintings and extensive handwritten notes about the cave and my tour experiences. (Dimensions: 5 1/4″ wide x 9 1/4″ high x 3/8″ deep; opened fully—approx. 24″ long)