Historical clue formulations

• Kind of sch. for grades one to six — 2025-10-28
• Kind of sch. — 2025-06-08
• K-5 sch. designation — 2023-08-29
• Like the first through fifth grades: Abbr. — 2021-10-04
• He, but not she: Abbr. — 2019-10-04
• Molybdenum, for one: Abbr. — 2017-12-06
• ___ sch. — 2016-11-11
• ___ sch. — 2016-10-13
• Low-grade?: Abbr. — 2016-01-10
• Like a sch. before middle school — 2015-04-13
• He is one — 2014-11-01
• Kind of school after nursery school: Abbr. — 2014-09-01
• Ca, Ce, Co or Cu — 2014-08-31
• K-5, schoolwise — 2013-09-17
• K-5: Abbr. — 2013-07-17
• Radon or radium: Abbr. — 2012-11-12
• Kind of sch. — 2012-09-16
• Sch. type — 2012-08-15
• K-6 sch. designation — 2011-08-10
• Kind of sch. — 2011-02-08
• Ca, Co or Cu — 2011-01-06
• Part of 51-Across: Abbr. — 2010-09-01
• I, for one — 2010-04-16
• ___ sch. — 2010-04-15
• B or C, but not A or D: Abbr. — 2010-02-14
• Na, Ne, Ni or No — 2009-12-27
• Something on a table: Abbr. — 2009-10-04
• Grades 1-6: Abbr. — 2008-07-01
• He or I, but not you: Abbr. — 2007-11-09
• I, O or U, but not A or E: Abbr. — 2007-05-12
• Kind of sch. — 2007-05-06
• Basic: Abbr. — 2007-02-10
• K-6: Abbr. — 2007-01-03
• Boron or bohrium: Abbr. — 2006-09-05
• ___ sch. — 2005-12-11
• Kind of sch. — 2005-10-20
• School before middle school: Abbr. — 2005-03-07
• Kind of sch. — 2005-01-02
• Low-grade?: Abbr. — 2004-05-29
• K, for one: Abbr. — 2004-02-20
• K-6, as a sch. — 2003-05-20
• Ca, Ga or Pa — 2003-01-02
• Kind of sch. — 2002-12-08
• Chem. table component — 2002-11-19
• I, for one: Abbr. — 2002-08-23
• Kr or K, say — 2002-04-07
• K-6: Abbr. — 2002-01-02
• I, O or U, but not A or E: Abbr. — 2001-03-11
• Gr. 1-6 — 1999-12-19
• Kind of sch. — 1999-06-29