Activists and Writers
- Howard Zahniser
- Others
- Abbey, Edward
- Adams, Ansel
- Anderson, Clinton
- Berry, Wendell
- Broome, Harvey
- Brower, David
- Carhart, Arthur
- Carson, Rachel
- Church, Frank
- Dickerman, Ernie
- Douglas, Marjory Stoneman
- Douglas, William O.
- Hunter, Celia
- Leopold, Aldo
- MacKaye, Benton
- Marsh, George Perkins
- Marshall, Bob
- Murie, Olaus and Mardy
- Nelson, Gaylord
- Oberholtzer, Ernest
- Pinchot, Gifford
- Putnam, Elizabeth Titus
- Stegner, Wallace
- Thoreau, Henry David
- Yard, Robert Sterling
- Zahniser, Howard
- Bibliography
- Quotes