7 books
This page collects the audiobooks by Burroughs, Edgar Rice that you can stream and download for free on 3ords.com.
7:18:54 
7:29:28 
7:47:37 
7:51:47 
7:58:08 
5:13:20 
4:43:14 7:18:54 7:29:28 7:47:37 7:51:47 7:58:08 5:13:20 4:43:14