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| Code | Description |
| EX | UI extract load |
| UI | UI, not loaded through the extract |
| ER | Information from the employer |
| SD | Wage record SUTA dumping detection system |
| ED | EDI data load |
| WR | Other wage record tool |
| RL | State record linkage/scoring |
| AR | ARS |
| MW | MWR |
| FS | Other federal/state program |
| BL | BLS weighted match system |
| MD | News Media |
| HS | Historical information - initial table load |
| OT | Other/Unidentified Source |