| Clue | Source | Date |
|---|---|---|
| Canvas for Grandma Moses | Newsday | 26 Nov 2022 |
| Multi-use hardboard product | LA Times Daily | 02 Dec 2021 |
| Hardboard brand | Wall Street Journal | 06 Mar 2019 |
| Hardboard brand | ||
| Construction board | Eugene Sheffer | 16 Mar 2017 |
| Hardboard brand | LA Times Daily | 21 Jan 2017 |
| Construction material | USA Today | 16 Nov 2015 |
| Construction material | ||
| Fiberboard brand | ||
| Movers' hardboard | ||
| 52 Across material | ||
| Composite board material | ||
| Brand of fiberboard | ||
| Pressed material used for countertops | ||
| Paneling material | ||
| Hardboard brand | ||
| Hardboard |