I have the System Service Manual for 400/800 computers. This is approx. 150 pages. Asking $15.US.
Also the Field Service Manual for the 810 Disk Drive. Approx. 120 pages. Asking $12.US.
Also De Re Atari - A guide to effective programming. For the 400/800 computer. This is approx. 200 pages. Asking $15.US.