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Entire collections of the Actae Sanctae Sedis (A.S.S.) and of the Acta Apostolicae Sedis (A.A.S.) – i.e., the official Acts of the Holy See from 1865 to 2007 – are available in pdf format, as is the twelve-volume collection of the “Actes et documents du Saint-Siège relatifs à la Seconde Guerre Mondiale”, published by order of Paul VI starting in 1965, and edited by a specialised group of four Jesuit historians.
These are the “Acts and Documents of the Holy See Relative to the Second World War.” Here’s the direct link, if you’d like to check them out for yourself, but alas, they’re in French, despite the fact that the URL plainly says “index_en.htm.”