The above is my image of the fragment of Homer’s Iliad (Book 5, lines 824-841), papyrus manuscript, c. 150 – 199 CE, currently on display at the University of Chicago. From “But Is It a Book?”:

This papyrus fragment bears 17 lines from Book 5 of Homer’s Iliad. Although epic poems from antiquity are typically divided up into books, the word would not have been understood in the way it is used today. The term comes from the papyrus “bookroll,” which was formed by affixing approximately 20 standard sheets of papyrus together that could be rolled up into a compact unit and hold roughly 700 lines of poetry – close to the typical book divisions of ancient epics.