Secretly Public Domain

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Most of the books published in the US before 1964 never had their copyright renewed, putting them in the public domain. Here are some of them.
Registration #A468148 - 1960-10-18
Title: Electrical noise.
Author: BENNETT, WILLIAM R.
Claimants: McGraw-Hill Book Co., Inc.
No renewal record found.
https://catalog.hathitrust.org/Record/001617399
Catalog Record: Electrical noise | HathiTrust Digital Library

Registration #A141057 - 1940-04-10
Title: Lacrosse.
Author: Stanwick, Tad
Claimants: A. S. Barnes & co., inc.
No renewal record found.
https://catalog.hathitrust.org/Record/009822664
Catalog Record: Lacrosse | HathiTrust Digital Library

Registration #A148288 - 1954-08-02
Title: The admiral and the Empress: John Paul Jones and Catherine the Great.
Author: LORENZ, LINCOLN.
Claimants: Bookman Associates, Lincoln Lorenz
No renewal record found.
https://catalog.hathitrust.org/Record/006223332
Catalog Record: The admiral and the Empress: John Paul Jones... | HathiTrust Digital Library