As my confidence man and master archivist, Gianfranco Armando, advised me last year in the crypt-like cafeteria next to the Secret Archives, I needed to focus on the Archive of the Congregation for the Doctrine of the Faith. Over the summer of 2018, I turned up a little-known register published by a team of researchers at Michigan University through Oxford University Press in 1998, Vatican Archives: An Inventory and Guide to Historical Documents of the Holy See.
