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.
Portrait of John Charles Phillips from "The Trustees of Public Reservations: Forty-Eighth Annual Report for the Year 1938." https://archive.org/details/annualreportoftr4449trus/page/n221/mode/2up?q="john+charles+phillips" Published in 1939, but no notice of copyright found anywhere in the report so within Public Domain. {{PD-US-no notice}}