> But the entirety of extant literature in Greek and Latin through to, say, the Late Empire is probably enough to fill a single small bookstore.

This is the entirety of extant Greek/Latin literature, with a full English translation: https://i.pinimg.com/originals/f4/1f/1e/f41f1eeffc2127a467df... (citing https://acoup.blog/2021/03/26/fireside-friday-march-26-2021-...). It's not so much a "single small bookstore" as it is "a large bookshelf".