| Clue | Source | Date |
|---|---|---|
| Kids' play places, across the pond | The Washington Post | 20 Feb 2022 |
| Kids' play places, across the pond | LA Times Daily | 20 Feb 2022 |
| Quarrymen's workplaces | USA Today | 06 Sep 2019 |
| Quarrymen's workplaces | ||
| Grainy places to dig | ||
| Rock debris sources | ||
| Excavation sites | ||
| Certain excavations. | ||
| Excavations for a building material. |