CHEM
Set to 6 different clues across 7 published puzzles, most often “Sci. class” — The New York Times, Saturday, 10 April 2004.
4 letters
Every clue on record, most used first
- Sci. class2 times
The New York Times — Saturday, 10 April 2004
- Bond analysts' field?: Abbr.once
The New York Times — Saturday, 13 June 2009
- ___ labonce
The New York Times — Saturday, 18 December 2004
- H.S. classonce
The New York Times — Tuesday, 3 December 2002
- With 5-Down, where reactions take placeonce
The New York Times — Monday, 12 February 2001
- Sci. courseonce
The New York Times — Wednesday, 17 March 1999