Some information on this issue supplied by Tom Lammers and the Atlas/Timely discussion list.
in Secrets of the Unknown (Alan Class, 1962 series) #156 (none listed) [cover]Cover credits obtained from an article in From The Tomb #10 (June, 2003)by Dr. Michael J. Vassallo and Frank Motler via the GCD Comics Database List.
in Secrets of the Unknown (Alan Class, 1962 series) #156 (none listed) [original title: Simon's Stooge!]
in Secrets of the Unknown (Alan Class, 1962 series) #156 (none listed) [original title: Who Lurks There?]
in Sinister Tales (Alan Class, 1964 series) #69 (1969)
in Secrets of the Unknown (Alan Class, 1962 series) #156 (none listed) [original title: The Frightened Man]
in Secrets of the Unknown (Alan Class, 1962 series) #156 (none listed) [original title: The Last of Professor Hogarth]
in Secrets of the Unknown (Alan Class, 1962 series) #156 (none listed) [original title: You Can't Find Me!]Error Report #3715, by Tristan Lapoussiere, noted that synopsis was incorrect. New synopsis from Frank Motler, via GCD Chat List, July 2010.