Clue | Source | Date |
---|---|---|
Directive for the board | New York Times | 18 Feb 2023 |
Chalkboard entreaty left for custodial staff | The New Yorker | 08 Jul 2019 |
Chalked warning left for custodial staff | New York Times | 30 May 2015 |
Chalked warning left for custodial staff | ||
Admonition to a hit man? |