UPDATE: I have just now had a chance to access this website myself and play around with it. Here are some observations. First, it looks like the most common language of the items is French. Second, the books are heavily skewed toward the subject of art. Third, and this is disappointing to me, I did a spot-check and all of the books that I checked were located at the Internet Archive! I see little use for this portal because of that.
In commemoration of its fourth anniversary, the Getty Research Portal "unveiled a new design and a total volume count surpassing 100,000. 'In assembling a virtual corpus of digitized texts on art, architecture, material culture, and related fields from numerous partners, the Portal aspires to offer a more expansive collection than any single library could provide,' writes project content specialist Annie Rana at the Getty’s blog The Iris. “Furthermore, with these freely downloadable materials, scholars and researchers can now be in possession of copies of rare books and other titles without having to travel to far-flung locales.” --from OpenCulture.com.
Access it
here.