From Bloomberg, the restoration of books looted from private Jewish libraries to the families:

Nazi-Looted Books Spell Decades of Labor for Libraries – Bloomberg:

The Central and Regional Library Berlin estimates it has as many as 250,000 books that are potentially looted. More than 40,000 were seized from the homes of Jews who were deported or murdered. So far, the library has returned 345 books and bookplates to 29 heirs. Peter Proelss, a historian investigating the collection, says he faces “a mountain of books.”

(Via www.bloomberg.com)