Original pencils credit to Ernest Schroeder changed to "?" by Craig Delich 2013-4-27, based Roy Thomas's assertion that Schroeder did not draw the Heap until issue #70.
Pencils and inks credit from Hames Ware via a private e-mail to Roy Thomas (22 March 2013).
Writer credit from Ed Silverman interview in Alter Ego magazine #120 (TwoMorrows, September 2013).