Source: A small 1970s paperback. Sorry!
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Note: We posted a found Web image of this a while ago, but when we located our own copy, we had to get closer. The original was in FF Annual #3. Our scan is from a later FF Annual, in which it was reprinted.
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Source: "Fantastic Four" #88
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Source: "Marvel's Greatest Comics" #29
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Source: "Fantastic Four Giant" #5
Source: "Fantastic Four" #96