"Before Stone we called it the Oligarchy."
Free book in PDF form. (text version also available on archive.org)
America's 60 Families - by Ferdinand Lundberg
A book written in 1937 that listed the families that made up the oligarchy, their businesses and their interrelationships. A few additions to "The Families" have been made over the years, but otherwise pretty much the same old thing today as it was back then.