Sending LOR directly to Columbia?

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I am in the same situation and called them like 4 months ago when I was getting together my letters, they said once your AADSAS is in then you can just mail it to them. I had my o chem professor write me one and send it to my University Health professions office in late june after I had already submitted my AADSAS with my other 3 (2 sci and dentist) and they said they would mail it to Columbia, you could also just have the professor send it straight to them.
 
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