|
| Number | Percent |
| DOT ERG | 7 | 77.8 |
| SDS | 7 | 77.8 |
| CDC | 6 | 66.7 |
| NIOSH | 6 | 66.7 |
| Plant Intranet | 3 | 33.3 |
| Other | 2 | 22.2 |
| PHMSA | 1 | 11.1 |