I mentioned here before that Raphael Ripa’s commentary on the De Ente, maybe the best and most important commentary on it, was available only in an impossible-to-read scan. I had given up. But somebody has now scanned it and put it on Google Books: https://www.google.com/search?tbo=p&tbm=bks&q=inauthor:%22Raffaele+Riva%22. You can also search under “Raffaele Riva.” Technology may breed texters and tweeters and what not, but it can be useful. Let’s start reading!