CBS Television via the Bureau of Industrial Service. During the 1950s and 1960s, television networks, program sponsors and studios often used either advertising or public relations agencies to distribute publicity materials. The Bureau was a division of ad agency Young & Rubicam.
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.
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