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

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

 Author: Mike Cline

Date: 1921

Source: Exacted from Public Domain PDF file of the Internet Archive Yellowstone National Park Obtained from

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