Historical clue formulations

• Some core classes: Abbr. — 2017-03-19
• Geol. and phys. — 2016-07-13
• Biol. and others — 2016-03-11
• Nobel pursuits?: Abbr. — 2014-08-15
• "Hard" or "soft" subjects: Abbr. — 2014-07-24
• Univ. grouping — 2013-05-11
• Biol. and others — 2012-08-05
• Chem. and bio. — 2002-03-26
• Biol., geol., etc. — 1997-12-21
• Univ. subjects — 1996-09-27
• H.S. requirements — 1994-07-23