Support letters — yes, lawyers usually say they’re valid for at most a year — that’s because you need to show the current relevance of the work. But publications, citations, and press articles are a different matter: they document the fact of recognition at the time they come out and don’t really have an expiration date. The officer looks at the overall picture: if an article is old but shows that you were recognized in the field, that works. The main thing is that there’s a connection to the type of activity listed in the petition.
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