(Apologies for the marginal OT, but browsing just now those pages and skimming over 'Dos años de vacaciones' from Verne, the automatic reconstruction was the misreading 'Dos años de vac·un·aciones'. It's really been two toll-taking years.)

Back to the topic: thank you! Any similar non-fictional material around? Edit: librivox also contains non-fiction, according to the filters. (I rest my case with relevance to the above note.) It is probably not the most specialized repository for informational or educational material though?

In fact, Spanish language records filtered as 'Non-Fiction',

https://librivox.org/search?title=&author=&reader=&keywords=...

still produce literature (works which have their value mostly in being literary products instead of contemporary essays).