“Hungary’s National Library recovered Wednesday 39 original opera librettos from operas of the 18th-century Austrian composer Joseph Haydn that were believed to have been destroyed during World War II, officials said. Curators working for the government had bought the librettos from an antiquarian who had bought them from a private individual… Curators working for the ministry of national cultural heritage formally handed them over to the library where they will be ‘under lock and seal’ until they are digitally reproduced for research work.”