And add The Further Adventures and Enquiries of Doctor Eszterhazy, if you would be so kind.
Indeed. Davidson started fascinating stories but rarely finished them; he always found something more interesting to investigate.
Then, there was John M Ford. Another writer would have given us a series of thick novels based on the alternate Europe he used in The Dragon Waiting.
The complete plays of Aristophanes–all 44 of 'em.
The Emperor Claudius’s histories of Carthage and Etruria–and his book on playing dice.
Add Claudius’s Etruscan dictionary to the pile, please!
Fool of a Took!
As everyone knows, Lasswitz’s Universal Library only has codexes. No ebooks.
And, while you’re at it, the Sybilline Books. The complete set, including the six volumes the Sibyl burned in our timeline.
The complete writings of Heraclitus and the complete poems of Sappho.
Since the Bible from OUR reality has no single author, nor anything else that you specified, you are necessarily requesting a Bible from not just a different timeline, but in fact an entirely different branch of the Universal Tree. I’m not seeing how that’s any different from The Silmarillion. 
All the books St. Patrick burned. With English translations, ideally.
The Junior Ganymede Club Book, please. If you can’t bring the whole thing, just copy the 18 pages marked Wooster, B.
All the Maya codices that in our timeline were burned by Bishop Diego de Landa.
All Chinese books that in OTL were burned by the First Emperor.
All Roman books and records that were destroyed during the invasion of the Gauls under Brennus.
Now that is a great idea. 
If there’s room in the bag, I’ll take Part Two of Dead Souls…
Can I have “How to build a time machine” by Doctor Emmet Lethrip Brown?
Me too!
I can’t imagine why. My posting history makes it clear that I never poop. Otherwise I would not be so full of shit.
Since the Irish didn’t learn how to write until they converted, I doubt Patrick had anything to burn.
I’m sure there is enough room in this massive library for the complete gene sequence for the cooler dinosaurs.
Perhaps Amelia Earhart’s black box recording is in there somewhere.
“How to talk to animals” by Mr. Dolittle M.D.
“Creating Life” by Frankenstein M.D.
I’ll need the Cliffs Notes for that, too, please. I can’t get through any Shakespeare without the Cliffs Notes.
Ooh, I’d like one of Alan Turing’s later works too. Specifically I’d like that 3-page monograph he wrote a week after he read Cook and Levin’s 1971 paper. You know, “Of course P=NP, here’s why, God I can’t believe Cook and Levin are so stupid”.
Actually no, forget that, I don’t think I’d understand that. How about instead his contribution to the “Complete Idiot’s Guide” series in the early 80s, a 400-page book with lots of prettily-coloured pictures called “P=NP so that even Nancarrow gets it”.