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This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. 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. العربية ∙ беларуская (тарашкевіца) ∙ čeština ∙ Deutsch ∙ Ελληνικά ∙ English ∙ español ∙ français ∙ Bahasa Indonesia ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ Nederlands ∙ português ∙ русский ∙ sicilianu ∙ slovenščina ∙ ไทย ∙ Tiếng Việt ∙ 中文（简体） ∙ 中文（繁體） ∙ +/−

Reasons for believing this to be in the Public Domain:

I recently copied (snipped) and cropped the photo as found in an article published 90 years ago (Willis Linn Jepson. 1929. The Botanical Explorers of California - V. Madrono 1:214-216., available online at: https://www.biodiversitylibrary.org/page/47993035#page/166/mode/1up).

The subject, Charles Lewis Anderson, died in 1910. The source of the photo was not given in the article. I haven't been able to find the name of the photographer. American botanists (and no doubt other professionals) of the later 1800s sometimes exchanged photos of themselves in lieu of actually meeting, due to the often great distances separating them. The photo used by Jepson may have circulated that way.

The author of the article (Willis Linn Jepson) died 73 years ago.