The ad appeared in the May 1, 1971 issue of Billboard and can be dated from that publication; it is pre-1978.

• There are no copyright markings as can be seen at the full view link.
  
• The ad is not covered by any copyrights for Billboard.
  
• US Copyright Office page 3-magazines are collective works (PDF)
  

"A notice for the collective work will not serve as the notice for advertisements inserted on behalf of persons other than the copyright owner of the collective work. These advertisements should each bear a separate notice in the name of the copyright owner of the advertisement."

St'òpira è ntô duminiu pùbblicu pirchì pubblicata ntê Stati Uniti ntra lu 1929 e lu 1977, nclusi, senza n'avvisu di copyright. A menu ca l'auturi non sia mortu di tanti anni, nun è ntô duminiu pùbblicu ntê Paisi o nta l'àrii ca nun àpplicanu la règula dâ durata chiù brevi pi l'òpiri statunitenzi, comu Canada (70 pma), Cina (50 pma, ma nun Hong Kong o Macau), Girmania (70 pma), Mèssicu (100 pma), Svìzzira (70 pma), e àutri Paisi cu trattati ndividuali. Talìa sta pàggina pi chiossai nfurmazzioni. 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） ∙ +/−