Credits for pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics. Inks originally credited to Joe Giella.
On inside front cover. This PSA ran in several DC Comics cover dated May 1960 and again in May 1965.
Credits for pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics.
Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics.
Information for this sequence from Arthur Lortie.
Letters to the science editor.