The only Conan novel written by Robert E. Howard himself is PUBLIC DOMAIN. I first encountered it under it’s ACE Books title, Conan The Conqueror.
Here’s a |CBZ| file scanned from the Ace Double (D-36) featuring The Hour Of The Dragon.
Other etext versions are available HERE.
Posted by Jesse Willis
And it’s already a free audibook:
http://librivox.org/the-hour-of-the-dragon-by-robert-e-howard/
I’m working on a post.