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PostIndex Liborum Prohibitorum (Luciano Dondero, Italy, 10/10/16 1:58 am)
Here is the chronology of a little search on this topic.
According to an article ("Index Librorum Prohibitorum") on the site http://www.revolvy.com/
"A complete list of the authors and writings present in the successive editions of the Index is given in J. Martínez de Bujanda, Index Librorum Prohibitorum, 1600-1966. A list of the books that were on the Index can be found on the World Wide Web."
And this is the link: http://search.beaconforfreedom.org/search/censored_publications/result.html?author=&cauthor=&title=&country=8052&language=&censored_year=&censortype=&published_year=&censorreason=&Search=Search
I did a search for Unamuno and did not find anything. But that's likely not to be conclusive.
Many places on the 'Net mention this censorship, for instance according to the entry for Miguel de Unamuno in the New World Encyclopedia:
"Unamuno's Del Sentimiento Trágico de la Vida as well as two other works La Agonía del Cristianismo (The Agony of Christianity) and his novella "San Manuel Bueno, mártir," were included on the Index Librorum Prohibitorum of the Catholic Church until the Second Vatican Council of the 1960s and are still considered works that orthodox Roman Catholics are encouraged not to read."
However, it seems that nobody provides a concrete reference that is checkable.
The site archive.org offers what it calls "Full text of 'The Roman index of forbidden books'" (see https://archive.org/stream/romanindexofforb00bettiala/romanindexofforb00bettiala_djvu.txt ) in a 1920 edition.
Here again Unamuno's name does not appear, but that should not be surprising as his books were published after that date, if I'm not mistaken.
And here is a Spanish book (https://books.google.it/books?id=eWDv3aDnFvIC&pg=PA7&lpg=PA7&dq=libros+de+Unamuno+en+el+Indice+de+libros+prohibidos&source=bl&ots=tx2Ld57SN3&sig=YEAcZvO5J3hfh_vxlBnGMjeCpN8&hl=it&sa=X&ved=0ahUKEwjL6_yEsc7PAhXpIsAKHcZuCl8Q6AEIMTAE#v=onepage&q=libros%20de%20Unamuno%20en%20el%20Indice%20de%20libros%20prohibidos&f=false ) that includes as an annex a "Decreto de la Congregacion del Santo Oficio de enero de 1957 incluyendo en el Indice de libros prohibidos las obras de Unamuno..."
JE comments: Great work, Luciano! Unamuno's "San Manuel, Bueno, mártir" is a staple taught in Spanish Lit survey courses. It's about as subversive as as Sunday school lesson, although it does deal with a potentially uncomfortable topic for the Catholic orthodoxy: What happens when a Man of God loses his faith?
Index Liborum Prohibitorum
(Enrique Torner, USA
10/11/16 6:39 AM)
My thanks to Luciano Dondero (10 October) for his great research. I had been wanting to read the Index Liborum Prohibitorum for a long time! It's fascinating to read the introduction. I am eager to read the whole book. Isn't there some special pleasure in finding out which books were in it and why? It seems to me that the mere fact that a book is in the Index would make you want to read it!
JE comments: Shall we call it the Vatican Seal of Naughtiness? There was a similar phenomenon in the Eastern Bloc of yore. Ban a book, and everyone wants to read it. Make it available to everyone, and you condemn it to oblivion.