* The Citadel
* The Conspiracy of the Gods
* The End of the World
* The Fall of the House of Dagon
Non-fiction:
* The Supernaturalist: A Life of H.P. Lovecraft
* Lovecraft: A Biography
* In Search of Lovecraft
* The Cthulhu Mythos: A Study in Cosmic Horror
Short stories:
* "The Black Stone"
* "The Call of Cthulhu"
* "The Colour Out of Space"
* "The Dunwich Horror"
* "The Shadow Over Innsmouth"
Poetry:
* "The Fungi from Yuggoth"
* "The Haunter of the Dark"
* "The Horror at Red Hook"
* "The Lurking Fear"
* "The Rats in the Walls"