The first page of a letter that Otis Adelbert Kline sent to Magic Carpet. It shows how they marked it before sending it to the typesetter. Patrick Ervin changed the character from Costigan to Dorgan and Howard’s name to Patrick Ervin. The story itself was going to appear in the next issue, but then Magic Carpet when out of business.

Source:

Dennis McHaney on the Robert E. Howard Inner Circle Discussion Group (Facebook).