In the US the rights (for paper at least) are held by
Rue Morgue Press.
It doesn't look like they do ebooks (if that's what you're wanting), but here's their contact info in case you wanted to check with them...
The Rue Morgue Press
87 Lone Tree Lane
Lyons CO 80540
Tel: 800-699-6214
Fax: 303-823-9799
E-Mail:
ruemorguepress@gmail.com