ecological movement", "a major influence on American attitudes toward our natural environment", "recognized as a classic piece of outdoor literature, rivaling Thoreau's Walden". The book has also had great influence on environmental thinkers: "along with Walden and Rachel Carson’s Silent Spring, one of the main intellectual underpinnings of environmentalism in America". The book has "attracted such overwhelming attention from environmental philosophers as a source of inspiration and ideas". See also Conservation in the United States Notes Further reading Callicott, J. Baird. Companion to a Sand County Almanac: Interpretive and critical essays (Univ of Wisconsin Press, 1987) Knight, Richard L. and Suzanne Riedel. Aldo Leopold and the Ecological Conscience. New York: Oxford University Press, 2002. . External links The Aldo Leopold Foundation 1949 non-fiction books Environmental non-fiction books Nature conservation in the United States 1949 in the environment