"Open textbooks are textbooks that have been funded, published, and licensed to be freely used, adapted, and distributed. These books have been reviewed by faculty from a variety of colleges and universities to assess their quality. These books can be downloaded for no cost, or printed at low cost. All textbooks are either used at multiple higher education institutions; or affiliated with an institution, scholarly society, or professional organization" (Open Textbook Library)
Appreciation to Ciara Hensley (UCF Adjunct Librarian, Spring 2018) for locating various open text collections and identifying which collections are likely sources for specific disciplines