File:Now Sheba Sings the Song (1987) front cover, 1987 first edition.jpg

As shown in the archive.org and eBay links above, no copyright notices can be found on the dust jacket.

There are two copyright registrations for Now Sheba Sings the Song (1987), TX0002124052 / 1987-05-04, and VA0000270350 / 1987-05-04. However, none of them are for the dust jacket.

There are no copyright registrations under the name "Jane Byers Bierhorst", the person who designed the jacket.

Therefore the dust jacket is in the public domain in the US.

This work is in the public domain because it was published in the United States between 1978 and March 1, 1989 without a copyright notice, and its copyright was not subsequently registered with the U.S. Copyright Office within 5 years. Unless its author has been dead for several years, it is copyrighted in the countries or areas that do not apply the rule of the shorter term for US works, such as Canada (70 pma), Mainland China (50 pma, not Hong Kong or Macau), Germany (70 pma), Mexico (100 pma), Switzerland (70 pma), and other countries with individual treaties. See this page for further explanation. Deutsch ∙ English ∙ español ∙ français ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ português ∙ português do Brasil ∙ русский ∙ sicilianu ∙ slovenščina ∙ 中文 ∙ 中文（简体） ∙ 中文（繁體） ∙ 中文（臺灣） ∙ +/−