I think the potential financial gain from selling these would be outweighed by potential copyright questions (as noted by Jim Jones) as well as fighting with image thieves (as noted by Randy Moe), so I recommend giving them to a university or military library (as noted by Jbenedict). You might see what kind of questions/response you get from an image bank service about selling the images to them, as a precursor of what you might be up against.
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