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Related Clues:
- Largest U.S. collection agcy.
- 1040 org.
- Recipient of many unhappy returns
- ___ agent
- Auditor's org.
- Sched. coordinator
- Org. with an April deadline
- Org. headquartered on Constitution Ave.
- Agcy. in D.C.'s Federal Triangle
- Schedule-publishing org.
- Letters in a return address?
- April 15 org.
- Treasury div.
- Org. that lets you e-file
- With 69-Across, taxpayer's dread