[tokai]

I'm really hoping that the library contains some lost older Greek works. But its going to be awesome what ever we find.

[helterskelter]

I'm hoping for a complete(ish) Heraclitus. Also Eratosthenes, whose methods have been described but we don't have the original work where we calculated the circumference of the Earth. Also Hipparchus and Thales.

[annodomini2019]

My pick would easily be the missing books of ab urbe condita by Livy, so much early Roman history that would be wonderfully filled out for us

[helterskelter]

Also, Aristarchus.