Action Comics 242 (July First Brainiac and the first appearance of The City of Kandor. The cover illustration is by Curt Swan. The story is written by Otto Binder, concocting quite an original sci-fi story. Al Plastino illustrates the story.
COMIC superman 199 This shows the classic style used for comic book art. It is completely different to modern art. the characters look like they have been drawn compared to modern images where they look more life like.