The library holds about 30,000 printed titles on microfilm or microfiche ranging from the fifteenth to the twentieth century. Published collections include the Biblioteca Palatina (12,000 titles from the Vatican Library’s Stampati Palatini collection, originally belonging to the University of Heidelberg), the Biblioteca Cicognara (4,800 titles, being the printed books of the Vatican Library’s Cicognara collection on art and architecture), Incunabula: The Printing Revolution in Europe, 1455–1500, and Manuscripta, Rare and Out-of-Print Books on Microfilm.
The Vatican Archives Papal Letters Registers on CD-ROM consist of digital image reproductions of the manuscript registers of papal letters housed in the Archivio Segreto Vaticano. The registers reproduced belong to two of the largest and most commonly consulted series: Registra Vaticana (Reg. Vat. 1–523), containing the texts of papal bulls and letters from John VIII (872–882) to Pius II (1458–1464), and Registra Supplicationum (Reg. Suppl. 1–265), containing the texts of supplications or petitions and their outcomes from Clement VI (1342–1352) to Martin V (1417–1431). View finding guide.
