| Clue | Source | Date |
|---|---|---|
| National litter cleanup program | Newsday | 12 Nov 2022 |
| Street cleaner's program | LA Times Daily | 22 May 2021 |
| Street cleaner's program | The Washington Post | 22 May 2021 |
| Highway beautification program | LA Times Daily | 08 Jun 2016 |
| Highway beautification program |