There are no copyright markings pertaining to the image as can be seen in the links above. At bottom left is Country of origin USA. At bottom right is Morgan Litho Company Cleveland, O. They printed the poster.
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.
Source: http://moderntimes.com/palace/black/poster/prairie.jpg
*Fair use rationale: This image is being used to illustrate the film in question and is used for informational or educational purposes only. This image is of low resolution. It is believed tha
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