| William Bartram Quotes | 1739 - 1823 |
| David R. Brower Quotes | 1912 - 2000 |
| Luther Burbank Quotes | 1849 - 1926 |
| Jack Hannah Quotes | 1947 - |
| Garrett Hardin Quotes | 1915 - 2003 |
| Joseph Wood Krutch Quotes | 1893 - 1970 |
| Aldo Leopold Quotes | 1887 - 1948 |
| Donella Meadows Quotes | 1941 - 2001 |
| John Muir Quotes | 1838 - 1914 |
| Roger Tory Peterson Quotes | 1908 - 1996 |
| Carl Pope Quotes | - |
| Will Steger Quotes | 1943 - |
