I'm very surprised that Howard's material isn't in the public domain. My (layman's) understanding was that, by the current law in the U.S., written works by private individuals enter the public domain seventy years after the author's death (Howard died in 1936).
Sounds like a good idea regardless of copyright law.something... that Derleth wrote... it's safer to avoid it.
![Devious :] :]](http://www.enworld.org/forum/images/smilies/devious.png)

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.