Hello Bob,
My comments to this are perhaps a bit off-topic of yours but basically you are right.
This is also true for our workshop manuals (W111 & others including 230, 250 SL and W108 - 113).
Those are not complete. Some parts are missing which were included in the original three-binders-issue of the original big blue book in the sixties. Many chapters are now missing.
When DaimlerChrysler reprinted our today well-known BBB about 10 years ago, they partly updated the content and made one book out of three binders. That's why many topics are missing.
On the other side the workshop manual is no replacement for the data tabular booklet. Many numbers can only be found there. Both book(lets) just work together and have to be used simultaneously to make sense.
Best,
Achim
(Magdeburg, Germany)