Most ironic find:

Catalog of Copyright Entries, New Series. Part 1, Group 2: Pamphlets, Leaflets, Contributions to Newspapers or Periodicals, Etc. Maps 1929: Vol 26 No 1-12

https://archive.org/details/catalogofcopyri261libr

That was already public domain twice over—uncreative catalogues of data aren’t copyrightable in the United States (see Feist v. Rural), and works of the U.S. federal government aren’t copyrightable in the United States.