The images are available for free for non-commercial and educational purposes, and permission may be granted for other purposes.To browse the collection follow the link here.
When I was searching through the collection, this one caught my eye. The only information I have about it is in the citation. The draughtsmanship is exquisite; I am thinking here especially of the delicate flowing lines that describe the head and facial features. This is something that should be studied by those wishing to learn iconography; the manner in which it conforms to the stylistic prototype makes the figures anatomically sound. If you look at the length of the forearm, for example, there is a foreshortening effect caused by the fact that the elbows of the patriarchs are tucked into their hips, and are some way behind the hands.
I encourage people to explore this treasury of images.