| Clue | Source | Date |
|---|---|---|
| Wearing away of a riverside slope | LA Times Daily | 24 Jun 2019 |
| Wearing away of a riverside slope | The Washington Post | 24 Jun 2019 |
| Wearing away of a riverside slope | ||
| Wearing away, on a waterway | USA Today | 04 Sep 2018 |
| Wearing away, on a waterway |