Dueling Wonders

Julius Schwartz mentioned in his wonderful autobiography, Man of Two Worlds, that there were certain elements which, when placed on the cover of a comic book, virtually guaranteed increased sales. The most famous example of this is the famed "Gorilla Effect" which I covered a couple years ago. Another certified sales technique involved having multiple images of the hero/heroine on the cover. Robert Kanigher appeared to be a fan of that particular gimmick:

This was all over the course of about five years, and these examples are just the most egregious. Kanigher found other ways to put two Wonder Women on the cover:

And there was always the option of dividing the cover into sections:

And this is even without counting the numerous "impossible" covers which featured Wonder Woman as a tot, girl and adult all at the same time:

Indeed, looking at them all, it almost appears that it was more likely to find multiple images of Wondy than single ones.