The Bureau of Industrial Service for NBC Television. In the 1950s and 1960s, it was common for networks, program sponsors and studios to use either ad or publicity agencies to distribute publicity materials. The Bureau was widely used by those in the industry for this purpose and 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.