I don't see early
Action Comics non-Superman covers very often. I ran across this image of #8 for sale on the internet and of course instantly recognized where the pose was swiped from. The cover for
Action Comics #8, dated January 1939, is by Fred Gaurdineer.
Below that is N.C. Wyeth's The Fight at Glen Falls, from his 1919 edition of
Last of the Mohicans. Maybe everybody knew this. I just stumbled across it last night.
