* The Fragments at the Threshold, (ms) Crypt of Cthulhu #6, St. John's Eve 1982; the HPL notes on which Derleth based The Lurker at the Threshold, transcribed by S.T. Joshi from HPL’s original manuscripts.
* History and Chronology of the Necronomicon Together with Some Pertinent Paragraphs (with August Derleth), (fa) The Arkham Sampler Winter 1948; revised by Derleth from “A History of the Necronomicon” by H.P. Lovecraft (The Rebel Press, November 1937).
* A History of the Necronomicon, (fa) Rebel Press, November 1937