There are two different Cabell works called (roughly) The Nightmare Has Triplets. One is a pamphlet, issued in connection with the publication of Smire, which explains the concept of the trilogy; the other is a later compilation which includes all three novels (Smirt, Smith and Smire). The former is here catalogued as The Nightmare Has Triplets: An Author's Note, and the latter as The Nightmare Has Triplets (Smirt, Smith and Smire). Please do not combine these two titles. (It was previously stated here that the anthology reprints the text of the pamphlet as an introduction, but this is not the case.)