Graduates of "research universities" earn more than liberal arts colleges

This from today's Wall St Journal.  Well, we sorta knew this, graduates with real engineering degrees earn more than graduates with art history degrees.  It's been a cliche that engineers make good well paid husbands.  For numbers, liberal arts graduates pegged out a $50,000 a year ten years out of college where as "research university" graduates made $65-70K at the median.  All of them made more than $50K.
    The Journal article skated over a couple of key points.  The never did define what they mean by "research university".  That's a new one on me.  I assume they are thinking of places like MIT, Georgia Tech, and CalTech.  Place which mostly grant engineering degrees and have strong STEM programs.
   Then they didn't pin down liberal arts.  Do they group the talkie-talkie majors (gender studies, art history, ethnic studies) or the wannabe sciences (sociology, anthropology, psychology, etc) in with the traditional seven liberal arts (English, foreign languages, history, mathematics, music, art, philosophy). 
   The traditional seven liberal arts ought to lead to better jobs than the talkie-talk majors and the wannabe sciences.