Steve Carper explains his criteria for One-and-Dones in the excerpts below from part one of his series that appears in The Digest Enthusiast No. 7–9:

“My criteria are subjective, obviously. I only include fiction; anthologies and collections count alongside novels, but nonfiction is out . . . . To be included, publishers had to be legitimate companies devoted to putting out the work of others . . . . Trying to settle on a definitionof a “digest” was surprisingly difficult . . . . I do not include chapbooks . . . . This [series] is my attempt to merge all my research into a single source listing.”

Steve proceeds in alphabetical order.

“Amazing Stories Science Fiction Novel is about as awkward an appellation as publishers’ lines ever get. Fortunately, its sole book was the 1957 movie tie-in 20 Million Miles to Earth by Henry Slesar. This is a prime collectible because of its rarity and the gigantic space lizard from Venus on its cover.”

Per the criteria, not a true One-and-Done as it was published by giant Ziff-Davis, but nevertheless a fascinating one-shot.