This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs. 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 (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties. العربية ∙ Deutsch ∙ English ∙ español ∙ français ∙ galego ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ português ∙ português do Brasil ∙ русский ∙ sicilianu ∙ slovenščina ∙ українська ∙ 简体中文 ∙ 繁體中文 ∙ +/−

A check on copyright.gov for the title Pioneers of Negro Origin in California shows no listings. Checked Sue Bailey Thurman and found that her only registrations and renewals were of her husband's work--listing them here--she did not renew this book. WorldCat link [1] proves the book was published in 1952.

   Type of Work: Text

Registration Number / Date: RE0000459734 / 1989-12-29 Renewal registration for: A00000507536 / 1961-05-24 Title: Mysticism and the experience of love. By Howard Thurman. Copyright Claimant: Mrs. Howard Thurman (Sue Bailey Thurman) (W)

   Type of Work: Text

Registration Number / Date: RE0000095829 / 1981-07-02 Renewal registration for: A00000115590 / 1953-11-25 Title: Meditations of the heart. By Howard Thurman. Copyright Claimant: Mrs. Howard Thurman (Sue Bailey Thurman) (W)

   Type of Work: Text

Registration Number / Date: RE0000210136 / 1984-05-11 Renewal registration for: A00000259950 / 1956-11-14 Title: The Growing edge. By Howard Thurman. Copyright Claimant: Sue Bailey Thurman (W)

   Type of Work: Text

Registration Number / Date: TX0001531273 / 1985-02-11 Title: For the inward journey : the writings of Howard Thurman / selected by Anne Spencer Thurman ; introd. by Vincent Harding. Edition: 1st ed. Imprint: San Diego : Harcourt Brace Jovanovich, c1984. Description: 302 p. Copyright Claimant: Sue Bailey Thurman Date of Creation: 1983 Date of Publication: 1984-04-30 Authorship on Application: editorial selection and compilation: Harcourt Brace Jovanovich, Inc., employer for hire of Anne Spencer Thurman. Basis of Claim: New Matter: "editorial selection and compilation."

   Type of Work: Text

Registration Number / Date: RE0000147921 / 1982-12-13 Renewal registration for: A00000161301 / 1954-11-17 Title: The Creative encounter; an interpretation of religion and the social witness. By Howard Thurman. Copyright Claimant: Sue Bailey Thurman (W)

Variant title: The Creative encounter

       This proves she did not do anything with her own works re: renewal or any later registrations.