We found our specimen at a local church fair and advise anyone with a drop of oil in their veins to look for such a gem.
Our copy dates from 1981, and all (then) current automotive technology is described in it. With the theory, the operation and the formulas to calculate anything and everything. It is now on the bedside table.
If you do not visit church fairs in the near future: the booklets can also be found on the Internet. Good catch and lots of reading pleasure!