Note: Swackles was the letter column for Amra. Some editors have listed the author as "uncredited", because no overall editor for the column was listed (although it was clearly George Scithers). Others have listed the author as "various" because, the letters themselves came from various authors. Two columns are listed as "Swackle" (singular), by L. Sprague de Camp. It is unclear whether the person entering the data ignored other letters, only a single letter was published, or whether, or whether Scithers presented that letter separately.