This collection of facsimiles of medieval manuscripts is organized by subject, reflecting the wide range of topics these works encompass. Many of these items do not fit neatly into one subject. For example, books of hours are fundamentally religious works, but are also significant as works of art. Consequently, some items may appear in more than one category, as they fit multiple themes. This approach allows for a more comprehensive exploration of the various dimensions—religious, artistic, scientific, and more—that these manuscripts represent.