71 FR 6421
There are multiple articles on volume 71, page 6421. Which article are you looking for?
Airworthiness Directives; RECARO Aircraft Seating GmbH & Co. (RECARO) Model 3410 Seats
Pages 6420 - 6421
A Proposed Rule by the Federal Aviation Administration
Regulations Governing Practice Before the Internal Revenue Service
Pages 6421 - 6437
A Proposed Rule by the Treasury Department