The library includes approximately 8000 books from the personal collection of Marie-Louise von Franz, as well as approximately 2000 books that were bequeathed to the library by Dr. Gotthilf Gut, J.D., Zurich, and Dr. José Zavala, M.D., Zurich. A modest number of new books are added each year. With prior notice, the library is open to the public. It is not a lending library at this time, but its books are available for perusal and extracts from them may be photocopied on site.