Since the other side of the survey was not able to be viewed, a copyright search was done in pamphlets for the year 1976. There were no listings for WIND Radio. There's no evidence that copyright was claimed on this material.
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.
{{Information |Description=Photo of radio personality Clark Weber from a 1976 en:WIND (AM) survey. |Source=[http://www.ebay.com/itm/WIND-CHICAGO-RADIO-MUSIC-SURVEY-TOP-56-OF-1976-ROD-STEWART-1-SINGLE-/371094877408?pt=LH_DefaultDomain_0&hash=item56...
File usage
The following pages on the English Wikipedia use this file (pages on other projects are not listed):