Limited Editions described:

A LImited Edition is a book that is signed and numbered by the publisher or artist/photographer, etc. Usually the number of copies is limited to a few hundred, but it could be larger. However, the smaller the total number of books in the edition, the more valuable they will become some day. By printing a larger run of soft covers with a small Limited Edition, you will be able to reach a wider audience, and by combining the soft cover with the Limited Edition your printing costs will be much more attractive.