This audio group is extremely large and will take up to 20 hours to listen to. In many respects, it is graduate-level. As the beacon of this site says- question everything.
Here is the link to the index of the files below-https://www.bibliotecapleyades.net/esp_dulcebook.htm
One- Chapters 1-3
Twelve- Chapter 31
Thirteen-Chapter 32 to the Summary