Amherst – English, history
Bowdoin – political science (http://www.bowdoin.edu/news/archives/1bowdoincampus/001355.shtml)
Carleton – geology (http://talk.collegeconfidential.com/carleton-college/1536797-how-does-carleton-produce-so-many-geology-phds.html)
Middlebury – foreign languages
Holy Cross - classics (http://academics.holycross.edu/classics)
Tufts - international relations (not a LAC)
WUSTL - biomedical engineering (not a LAC)
Williams - art history, math (http://www.nytimes.com/2004/03/31/arts/legacy-one-college-s-long-shadow-looking-back-at-the-williams-mafia.html)
Those are some departments I associate with them, for one reason or other. Let’s see if other posters agree.
By the way, what’s an “HA” Liberal Arts College?