These items are Dover paperbacks on technical and scientific topics. Some are vintage and some are modern reprints. All items are in readable condition with covers intact. The items listed as in acceptable condition are for issues like heavy wear or delamination to the covers. The item listed poor has a hole punched through the back cover and through several advertising pages in the back of the book (all of the content is readable). Book condition, year published and pricing are shown in the dropdown menu. Please let me know if you would like more information or photos of individual books. Thanks for shopping!