- Natural state, by Stuart Allan, Episode 5
- Natural state, by Stuart Allan, Episode 23
- Natural state, by Stuart Allan, Episode 3
- Endangered species
- The naturalist, Theodore Roosevelt, a lifetime of exploration, and the triumph of American natural history, Darrin Lunde
- Duel for the dunes, land use conflict on the shores of Lake Michigan, Kay Franklin and Norma Schaeffer
- Extinction, the causes and consequences of the disappearance of species, Paul and Anne Ehrlich
- Natural state, by Stuart Allan, Episode 6
- Natural state, by Stuart Allan, Episode 19
- Endangered species, protecting biodiversity, Kim Masters Evans
- How to help the environment, by Richard Carrion
- The future of life, Edward O. Wilson
- Conservation for the twenty-first century, edited by David Western, Mary C. Pearl
- Rescuing the planet, protecting half the land to heal the earth, Tony Hiss ; introduction by E.O. Wilson
- Natural state, by Stuart Allan, Episode 25
- Natural state, by Stuart Allan, Episode 17
- Natural state, by Stuart Allan, Episode 10
- Conservancy, the land trust movement in America, Richard Brewer
- Natural state, by Stuart Allan, Episode 13
- Natural state, by Stuart Allan, Episode 21
- A Sand County almanac., With other essays on conservation from Round River., Illustrated by Charles W. Schwartz
- Ten days to paint the forest, directed & filmed by Richard Kemp ; written by Richard Kemp & Petra Regent ; produced by Richard & Julia Kemp ; an Augur Films production
- The Fragile environment, the Darwin College lectures, edited by Laurie Friday and Ronald Laskey
- Natural state, by Stuart Allan, Episode 16
- Natural state, by Stuart Allan, Episode 8
- Natural state, by Stuart Allan, Episode 22
- Natural State, by Stuart Allan, Episode 24
- Natural state, by Stuart Allan, Episode 12
- Conservation biology for all, edited by : Navjot S. Sodhi, Paul R. Ehrlich
- John Muir and his legacy, the American conservation movement, Stephen Fox
- Natural state, by Stuart Allan, Episode 20
- Watching, from the edge of extinction, Beverly Peterson Stearns and Stephen C. Stearns
- The creative lives of animals, Carol Gigliotti
- American Earth, environmental writing since Thoreau, edited by Bill McKibben ; foreword by Al Gore
- Natural state, by Stuart Allan, Episode 15
- A Sand County almanac & other writings on ecology and conservation, Aldo Leopold ; Curt Meine, editor
- Natural state, by Stuart Allan, Episode 18
- Natural state, by Stuart Allan, Episode 11
- Natural state, by Stuart Allan, Episode 7
- The national parks, America's best idea, a Florentine Films production ; a film by Ken Burns ; written by Dayton Duncan ; produced by Dayton Duncan, Ken Burns ; WETA
- Rewilding, the radical new science of ecological recovery, Paul Jepson & Cain Blythe
- Natural state, by Stuart Allan, Episode 4
- Thirsty planet, strategies for sustainable water management, Constance Elizabeth Hunt
- Wild hope, on the front lines of conservation success, Andrew Balmford
- The Last extinction, edited by Les Kaufman and Kenneth Mallory
- Conservation, a beginner's guide, Paul Jepson and Richard Ladle
- Sharks, stewards of the reef, [directed] by Holiday Johnson
- The aliens among us, how invasive species are transforming the planet--and ourselves, Leslie Anthony
- The Official World Wildlife Fund guide to endangered species of North America, [managing editor, David W. Lowe, editors, John R. Matthews, Charles J. Moseley]
- Beyond Black Bear Lake, Anne LaBastille