While books are highly collectible, they do not offer a large return on the initial investment. Signed first editions bring the greatest interest from collectors and the older the book, the better. Books that have historical significance are desirable, as are those that have been illustrated by artists of note. The condition of the book is important, so care must be taken in maintaining not only the pages, but the covers and the spine as well. A reputable bookseller can help with information as to the best ways to do this.