Upvote:2
I have no factual elements to justify my answer, but I am pretty sure that an approach based on cultural events by that time is accurate. I mean:
All those elements describing the literary of the 1930s lead me to think that most manuscripts were duplicated enough to escape bombings, whose part of which were devastating was mainly concentrated in Germany.
About Nazi destruction of books, well... of course there were autodafes but targeted books were precisely those who were spred enough in Europe to be considered as a danger. So it's reasonable to say that those *autodafes" made books disappeared from Germany, but not from entire Europe nor world. During occupations, well similar logic could apply, except for specific Jewish texts that could have disappeared.