File:The Clue in the Diary (1932) dust jacket, 1939A-19 printing.jpg

The back cover and back flap of the dust jacket are not shown in their entirety, so the lack of a copyright notice is not certain. However, at least one dust jacket featuring the same cover art, but from a different printing, is known to be published without a copyright notice.

AbeBooks:

• image 1 (front cover)
• image 2 (back cover)
• image 3 (spine)
• image 4 (front cover without dust jacket)
• image 5 (front and back flaps)

Thus it is reasonable to assume that this dust jacket is published without a copyright notice.

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） ∙ +/−