Action Comics (1938-) #350

“THE SECRET OF THE STONE-AGE SUPERMAN!” Superman travels over a million years into the past to uncover the secret of a caveman skeleton in a Superman costume!

Written By:
Henry Boltinoff, Otto Binder, Leo Dorfman
Pencils:
Henry Boltinoff, Jim Mooney, Wayne Boring
Inks:
Henry Boltinoff, Jim Mooney, Wayne Boring
Cover By:
Curt Swan, George Klein