- National Park Service
- Rainforest Action Network
- The Nature Conservancy
- The World Book Encyclopedia
- World Wildlife Fund
- World Resources Institute
- Audubon magazine, Jan-Feb 2001, “The Future of Wood (and our woods)”
- "Saving Our Ancient Forests" by Seth Zuckerman, The Wilderness Society
- "Audubon Natural Priorities" by Roger DiSilvestro
- "Journey through a Northern Rainforest" by Karen Pandell
- "Wild Woodlands The Old-Growth Forests of America" Photos and text by Bill Thomas
- "Our Changing Earth by" Thomas Y. Canby, The National Geographic Society
- “How You Can Help Save our Planet” by Thom R. Haret
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