Hardback. Used condition. Check my shop for a lot of other books! Happy to combine shipping on books. If interested in more than one book, please contact me BEFORE purchasing. Books will be mailed media mail via USPS. Please let me know if you have any questions. Used condition: book may have minor issues such as sticker residue, minor cover blemishes, discolored pages, minor page bends, etc.  If there are major issues, they will be listed in the book description.#dinosaur#nonfiction#hardcover#encyclopedia