Making the best of Pratchett reading with a map. You’ll still not get all the cross references until you read the books a second time, though. It’s interesting to see that some of the groups can be read from starter books at each end.
I’d like to see someone do this for Michael Moorcock novels. There are some quite remarkable parallel plots and “crossover” chapters in some of the classic Moorcock novels.
This diagram resembles a small MUD map, which is pleasantly appropriate.