Acta redacta
Thanks to Fr Z for the news that the Acta Sanctae Sedis and the Acta Apostolicae Sedis have now been put online at the Vatican website.
The Acta Sanctae Sedis ran from 1865 to 1908, carrying the documents of the Holy See. In 1904, its contents were designated as "authentic and official". It was replaced in 1908 by the Acta Apostolicae Sedis which was given a more specific authority in that teh legal documents published are considered to be promulgated when published, and effective three months from the date of publication, unless a shorter or longer time is specified in the law itself.
These Acta are essential for those wishing to give authentic references to official documents of the Holy See and have hitherto only been available to those with access to a Catholic library that carries them. Providing them online is an important and significant service. The picture above is page 481 from the 1968 volume: the first page of the encyclical Humanae Vitae.