Beetle and Karmann Ghia Service Manual, Type 1 : 1966, 1967, 1968, 1969
(Volkswagen Service Manuals from Robert Bentley, Inc) by Volkswagen
of America Inc.
This is the definitive factory shop manual.
Chapters: Getting Started, Engine, Fuel System, Front Axle, Transmission
and Rear Axle, Automatic Stick Shift, Brakes, Lubrication and Maintenance,
Body and Frame, Electrical System.
The engine, fuel, axles, brakes and transmission chapters are great.
The body and frame doesn't cover the more difficult repairs like head
liners. Some repairs assume that you are using all the special VW tools.
Before getting this book you'll want "How to Keep Your Volkswagen
Alive" which shows all the good shortcuts, and gives advice. The
shop manuals assume that you are a mechanic, and often leave out advice
based on that assumption.
My 1972 edition has mostly color wiring diagrams. The black and white
diagrams have wire color codes.