File:Yellowstone National Park Brochure (1921) Union Pacific.JPG

Description: Union Pacific's 1921 brochure of Yellowstone National Park.

 Author:

Date: 1921

Source: Obtained from [ Wikipedia Commons.]

Permission: Public domain. This image is in the public domain because its copyright has expired. This applies to the United States, Canada, the European Union and those countries with a copyright term of life of the author plus 70 years. Copyright Term and the Public Domain in the United States 1 January 2009