71 FR 1721
There are multiple documents on volume 71, page 1721. Which document are you looking for?
Airworthiness Directives; Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747SR, and 747SP Series Airplanes
Pages 1718 - 1721
A Proposed Rule by the Federal Aviation Administration
Federal-State Joint Board on Universal Service; High-Cost Universal Service Support
Pages 1721 - 1730
A Proposed Rule by the Federal Communications Commission