Pre-1989 publications without a copyright notice include:
"Local officials ready for tornado season", Charles City Press, April 5, 1977, page 1
"Killer tornado", Charles City Press, May 13, 1983, page 1
The Charles City Press does not appear in the Catalog of Copyright Entries for 1977, and more importantly, does not appear in a search of the Copyright Catalog at the Library of Congress.
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 (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
Uploaded a work by L.L. Lane for the Floyd County sheriff's office from * https://web.archive.org/web/20221015120911/https://ericsweatherlibrary.files.wordpress.com/2013/02/charles-city-tornado.jpg with UploadWizard