Amazon has strict product matching and unusual data format requirements that don't completely conform with industry standards, so it is impossible for Biblio to guarantee that all of your listings will carry over to Amazon. We do put forth our best effort to map your data to Amazon's specific requirements. We typically achieve an 80-85% success rate, which is about industry par. You can log in to Amazon to view their reports on why particular items may not be appearing, and adjust those listings accordingly.