This presentation is based in part on :
- Kenneth Clark, Landscape into Art
- William H. Goetzmann, Exploration & Empire: The Explorer and the Scientist in the Winning of the West
- Eugene C. Hargrove, Foundations of Environmental Ethics
- William K. Hartmann, Ron Miller, and Pamela Lee, Out of the Cradle: Exploring the Frontiers beyond Earth
- Hans Huth, Nature and the American: Three Centuries of Changing Attitudes
- Weston J. Naef, Era of Exploration: The Rise of Landscape Photography in the American West, 1860-1885
- Roderick Nash, Wilderness and the American Mind
- Majorie Hope Nicolson, Mountain Gloom and Mountain Glory
- Barbara Novak, American Painting of the Nineteenth Century
