Section 4 is 43 pages dedicated to Williams. The book does not cover later circuits, although the principles learned can be easily be applied to later machines. Hornick, is the best textbook ever written on the subject of early solid state pinball repair I think it was originally written for a University course in pinball repair at a Canadian University. This item is in the category "Video Games & Consoles\Coin-Operated Gaming\Pinball Machines".The seller is "*enterprise-ncc-1701*" and is located in this country: GB. This item can be shipped worldwide.