Because of the way we retrieve data from Amazon (by ISBN number) we can only add books if they have an ISBN. It is very time-consuming to add a book's data manually so we are not able to do it for a large volume of books. However, we will add the data for any non-ISBN books that a member wants to index. Just email us at [email protected] with a request and supply book title, subtitle, author, publisher, country and date of publication, format, number of pages and a scan or photo of the book cover (don't worry about sizing or cropping as we can do that here).