I worked in a books warehouse before college and two of their books had a little accident and ended up in the rejects bin along with some of my course texts. I lent the P and R books to someone and forgot who so actually bought them later on. They are amazing.

I also remember how short things like Iterated Function System plotters could be - eg a few dozen lines of BASIC could get you a complicated fern piccy in a few seconds on a 80286.

I suspect they had access to some decent Unix workstations with expensive displays. The quality of the plates was breathtaking - you can barely see the graduations in many of the images and they are totally smooth in most of them.

I've just had a massive hit of nostalgia - thanks!