73 FR 23390
There are multiple documents on volume 73, page 23390. Which document are you looking for?
General Regulations for Areas Administered by the National Park Service and the Fish and Wildlife Service
Pages 23388 - 23390
A Proposed Rule by the National Park Service and the Fish and Wildlife Service
Registration of Claims to Copyright, Group Registration Options
Pages 23390 - 23393
A Proposed Rule by the U.S. Copyright Office, Library of Congress