As another source, the Congressional Biographical Guide's [entry on Minton http://bioguide.congress.gov/scripts/biodisplay.pl?index=m000800] reports that Minton "graduated from the law department of Indiana University at Bloomington in 1915, and from Yale University in 1916." The Guide has been published for decades, and this entry is probably based on information that Minton's office would have provided while he was in the Senate, although someone can look up the contemporaneous hard-copy version to try to be sure.