Only add files with page number
Academic customers can only really use eBooks if there are page numbers included in the files. It would be great if you could ask publishers to think about that when delivering the data - If a title is to be incluced in an academic project, is has to be citable.
Most academic citation styles have guidance on how to cite ebooks that may not include page numbers. The Ebook Central online reader incudes pagination information that is visible to patrons in the toolbars.