The New Discworld Companion

The book compiles a precise (and often quoted directly from the books concerned) definition of words, lives of historical people, geography of places and events that have appeared in at least one Discworld book.The third edition named The New Discworld Companion includes articles about books up to Night Watch, as well as Discworld related books and short stories. The book also contains a 10-page interview with Pratchett titled Discworld Quo Vadis?.