Grinnell again

I was surprised to come across a mention of Grinnell College on National Review's website...in an article by Thomas Sowell, no less:

[ Measuring college outputs ] One of my own favorite measures of output— the percentage of a college’s graduates who go on to get Ph.D.s — was not used by either set of evaluations.

Small colleges dominate the top ten in sending their alumni on to get doctorates. Grinnell College, which was not among the top ten on either the U.S. News list or on Professor Vedder’s list, sends a higher percentage of its graduates on to get Ph.D.s than does either Harvard or Yale.