Set the search filter to "Full view only" and pre-1900. Many 16th-century printed editions have been digitized from the Bavarian State Library and the University of Lausanne.
Before buying a $50,000 incunable, download the free from the BSB to compare bindings, watermarks, and rubrication styles. summa casuum pdf
The Vatican’s digitization project has released several Summa Casuum manuscripts. Look for or similar shelfmarks. Download as PDF directly. Set the search filter to "Full view only" and pre-1900
You can find digitized historical manuscripts and early printed editions of these texts on the following platforms: summa casuum pdf