English: This is part of a larger dust jacket that is believed to be public domain. The dust jacket features no copyright marks or claims in the official catalog as was required at the time. This is from the 4th printing of the book. This image features the author and a horse.
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.