| Clue | Source | Date |
|---|---|---|
| Significant stone found around large quarry (6,3) | ||
| *Quarry that supplies aggregate | LA Times Daily | 08 Sep 2021 |
| *Quarry that supplies aggregate | The Washington Post | 08 Sep 2021 |
| Landscaper's supply stop | Newsday | 23 Nov 2019 |
| Where 11-Down worked | ||
| Pebble mine | ||
| Source of road-building material. |