If you have difficulty getting ISU Adobe IDs to access Adobe Digital Editions content for some ebooks, try setting up and using a personal Adobe ID.
Research libraries like ours subscribe to numerous electronic databases and indexes in various subject areas from familiar companies like EBSCO and ProQuest, among many others. A few sites are dedicated to gathering accessibility data and reports related to how accessible these tools are. The following resources should be helpful.
ISU Library acquires ebooks from a number of publishers, with EBSCO and ProQuest among the leaders. On this page you'll find information related to accessibility statements from various ebook publishers, plus additional information.