This maybe seems like a weird question, but since I started using TeX/LaTeX I see more and more things in "real life" that seem to be set with it. E.g. the train timetables here in Germany are set with some kind of TeX usually and you can clearly recognize the computer-modern-fontface. Now, after quite a long time, I looked something up in my Brockhaus (German encyclopedia) from 1980 and, though, I am no expert, I believe it was set with TeX too. The font looks pretty much like CM, the equations look a lot like CM and so on.
So, does anyone know what the Brockhaus was set with in the 80's? Or does anyone recognize what it was if it wasn't some kind of TeX?