This page contains the following sub-pages:
- Bower, David (1912-2000)
- Carson, Rachel (1907-1964)
- Humboldt, Alexander von (1769-1859)
- Leopold, Aldo (1887-1948)
- Muir, John (1838-1914)
- Olmsted, Frederick Law (1822-1903)
- Pinchot, Gifford (1865-1946)
- Powell, John Wesley (1834-1902)
- Roosevelt, Theodore (1858-1919)
- Thoreau, Henry David (1817-1862)
