Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
The copyright has definitely expired in the USA. The 1944 copyright to "80 Eventful Years: Reminescens of Ludwig Ernest Fuerbringer" expired in the early '70s because the publisher, Concordia Publishing House, chose not to renew the copyright. As a result, the book was scanned by Google and is available for full view at http://hdl.handle.net/2027/mdp.39015071145463?urlappend=%3Bseq=207 . The link will take you to page 187, the page of the image. The listing at the Hathitrust Digital Library states "Copyright: Public Domain, Google-digitized". I checked out their claim with the official copyright renewal registration records and found that Hathitrust was correct by saying the work is public domain, because it was not renewed.
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