Credits for pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics.
art reprinted from various sources, including the cover to Action Comics #373
Illustrated with panels from Superman's Girl Friend, Lois Lane (DC, 1958 series) #23, Action Comics (DC, 1938 series) #295, Action Comics (DC, 1938 series) #317, Adventure Comics (DC, 1938 series) #387, and Adventure Comics (DC, 1938 series) #388.
Reprint information corrected by Jim Stangas.
Superman figure taken from the cover of Shazam! #1.
reprinted covers with altered dialogue
originally a Superman feature
originally a Superboy feature
Originally a Superman feature. Inks credit from the index of the original printing. George Klein credited on the splash page.
Logo design credit from Todd Klein via his Facebook posting Comics Logos B #74: BRAINIAC on 31 May 2021.