Yes, the famous 29A - it has to be famous as the only other routes that have books about them, apart from those mentioned in the David Harvey Bus Routes, route by route 1925 - 1975, are those about the Inner Circle 8 and Outer Circle 11. I have never seen one about the City Circle 19 although but it did travel around much of the older interesting industrial parts of town. The tram route to The Lickeys 70, has a book as well.
I notice the newer route changes in the 1969 map gearing up for the infamous PTE I guess.