This has 148 pages and 4 sections. Section 2 is 42 pages dedicated to Bally.
Section 3 is 39 pages dedicated to Gottlieb. 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.