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So I am in the process of getting my LORs together for the upcoming cycle and had a quick question. For the past two years I have been working as a payed systems engineer intern for a fortune 500 company. Should I include an lor from my manager or only get lors from professors?

I asked a similar question, responses were more or less "try to get LoRs from Profs if you can, use professional reference as a third rec".

2 from profs
1 from boss