Copyright expired because the work was published without a copyright notice and/or without the necessary copyright registration.
Other information
The The Phoenix Jewish News ceased publication sometime before 1984. There is no copyright markings apparent on the digital copy of the newspaper, as can be seen at the full view link.
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.