Related Clues:

• Employees' ID's: Abbr.
• ID's of a sort
• Nine-digit ID's
• Some ID's
• Workers need them: Abbr.
• ID's, of sorts
• I.R.S. info
• I.R.S. ID's
• ID's for the I.R.S.
• ID info
• They have only nine digits (Abbr.)
• Worker IDs
• IRS IDs
• Taxpayer IDs
• Workers' ID's