| Author: | United States. National Park Service |
| Subject: | F721, Grand Canyon of the Yellowstone (Wyo.) -- Guidebooks |
| Format: | Electronic text |
| Date issued: | 2021 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | Guide to the Canyon Area [electronic resource] / United States. National Park Service |