http://seo.harvard.edu/
Harvard Student Employment Office ?  
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"39% of seniors reported that they began working during their freshman year"
"78% of students had part-time work at one point, including both on and off-campus"
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Several Providers mention in their ads that they are GRAD students in the Boston area, not UNDERgrads but don't mention which schools.

Years back, I was enjoying a meeting with a touring Provider from Chicago. She mentioned that she was a student there. At that time, there was a train derailment on the Chicago L near some UC buildings that actually made the news in Boston. (There wasn't enough Boston news that day? I also need to know about an armed robbery at a mini-mart in Toledo, Ohio -- don't worry, nobody was injured and the thief got away with $70 and a bag of Doritos. Whatever ...) She panicked and said something like, "How do you know about that??!?!? Are you from Chicago??!! You are really from Chicago!!" and other panicky 'maybe this guy has seen me on the street or at UC in Chicago' stuff. I told her that it had been in the local (BOSTON) news and that I was not from Chicago but the damage was done. It was a great 50 min but ended badly because she thought I was from Chicago.  
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Good luck and let us know what happens!

EOM

I have a feeling that something like this you'd have better chance finding on Seeking than anywhere else. Unless you get a direct lead of course.