The front and back covers of a hardcover book. So called because many early book covers were originally wood boards. See Book Club. Book Block - The entire book sewn together before it is bound. Book Club - Edition of a book printed especially for a book club.
All books are of a uniform size and usually produced with cheaper materials.
Book Label - A label indicating the ownership of a book. Generally smaller than a bookplate. Book-Plate A label placed in a book to indicate ownership. Most book-plates are decorative, often with the intent of portraying some insight into personality of the book's owner. On early bindings, a raised metal stud intended to protect the cover of a book from abrasion.