John Reps is the dean of scholars on this topic. His classic Views and Viewmakers of Urban America is the "bible" on the subject, not only because of Reps amazing listing of thousands of these views, but also because of his insightful text on the views and their makers. Well, John added to this story in a very interesting slide show which can be seen on the internet. It talks about how the prints were made and includes some fascinating images that I have never seen. Anyone interested in this topic should take a look!