Photograph was published without a copyright notice. Confirmed on copyright.gov, all issues of the Hartford Courant from 1992 to 2018 have been renewed for all issues annually. Prior to 1992 when full annual renewals of all issues occurred only specific articles were renewed. Checking title, name, and keyword for "People Must Stop War, Paris Delegate Urges", Elaine Johnson (journalist), and Miriam Butterworth (subject), all return "Copyright Catalog (1978 to present) Your search found no results. Refer to search examples, check spelling or try another search type”, indicating that there is no copyright or any copyright that might have existed was not renewed.
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.