| Answer | Crossword Clue |
|---|---|
| AREACODE | Three-digit ID |
| SSAN | Nine-digit ID |
| SSN | 9-digit ID |
| SSN | Nine-digit ID |
| SSN | Nine digit ID |
| SSN | Taxpayer's nine-digit ID |
| SSN | Nine-digit ID (Abbr.) |
| ISBN | Publisher's 13-digit ID |
| SSA | Nine-digit ID issuer |
| SSN | Nine-digit government ID |
| SSA | 9-digit ID issuer |
| SSA | 9-digit ID organization |
| ISBN | 10-digit book ID |
| ISBN | 13-digit publishing ID |
| SSN | Nine-digit govt. ID |
| SSN | Nine-digit ID: Abbr. |
| SSA | Nine-digit ID source |
| ISBN | 13-digit ID in publishing |
| ISBN | 10- or 13-digit ID |
| SSN | Taxpayer's nine-digit ID: Abbr. |
| ISBN | 10-digit ID at Amazon.com |
