Craig Delich and Pat Lang contend that Sheldon Moldoff was the inker. Letters credit from Todd Klein via his Klein Letters blog (18 September 2016, http://kleinletters.com/Blog/ira-schnapp-in-worlds-finest-comics-part-1/).
Bob Klein and Gene Reed say Charles Paris inks.
Public service announcement that ran in the July 1960 (cover dates September and October) issues of DC Comics.