English: Letters to Betty Crocker to be answered by the General Mills Home Service Department, screen shot from the film 400 Years in 4 Minutes, Prelinger Archives
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 (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
{{Information |Description ={{en|1=Letters to Betty Crocker to be answered by the General Mills Home Service Department, screen shot from the film ''400 Years in 4 Minutes''}} |Source =[https://archive...