Inside Yellowstone - Hayden Valley
Yellowstone National Park, Its Exploration and Establishment - Hayden and Barlow Parties
Washburn and Hayden Expeditions
Past Climatic Patterns - Official Park Website
Ferdinand Vandeveer Hayden - Wikipedia
Thomas (Yellowstone) Moran - National Gallery of Art
Thomas Moran - Wikepedia
Thomas Moran - American Visionaries - National Park Service Website
Thomas Moran - Yellowstone Artwork - National Park Service Website
Thomas Moran's Diary - Official Park Website
William Henry Jackson - Wikipedia
William Henry Jackson Photos - National Park Service Website
Did You Know?
At peak summer levels, 3,500 employees work for Yellowstone National Park concessioners and about 800 work for the National Park Service.