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Source: "Sgt. Fury Annual" #1, by way of http://bullyscomics.blogspot.com/2009/07/loose-lips-sink-ships.html
Source: "Gems" #4
Source: "Adventure Comics" #390.
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Source: Green Arrow & Martian Manhunter story in "The Brave & The Bold" #114
Source: "Four Color" #71
Source: "Batman" #202
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Source: "Fantastic Four" #12, via a late '60s reprint.
Source: "Superman Annual" #4
Source: Rip Hunter story in "Detective Comics" #225
Source: "Captain America" #202. Jack Kirby.