Stored only. There are some signs of use, but no markings. Please check the photos. Please refrain from purchasing if you are concerned about minor imperfections, as this is a used item. This is the book "Salt Sugar Fat: How the Food Giants Hooked Us" by Michael Moss. It explores how the food industry uses salt, sugar, and fat to attract consumers. It was a #1 New York Times bestseller. It reveals how major food companies "hooked" people. The Observer called it "chilling and revelatory."