I’m also interested in looking for any books which cover pre-Second World War racing.
I’ve read about Fangio’s exploits too and the stories are just insane. If you’re looking for more of that sort of thing Richard Williams’ biography of Enzo Ferrari has a lot of good accounts of his exploits with Alfa Romeo in the Targo Florio, Mille Miglia etc with drivers like Nuvolari, Varzi and Moll.