Progressive+Project

Cohen, Michael P. The History of the Sierra Club, 1892-1970. San Franciso : Sierra Club books, 1988. Jones, Howay R. John Muir and The Sierra Club: The battle for yosemite. San Franciso: Sierra Club, 1965. Turner, Tom. Siera Club: 100 years of protecting nature. New York: Harry N. Abrams, 1991.

Fox, Stephen R. John Muir and his legacy: the American conservation movement. Boston: little, bown, 1981. Hays, Samuel P. Conversation and the gospel of efficiency: the progressive conservation movement,1890-1920. Cambridge, MA: Harvard University Press, 1959. Nash Roderick. Wilderness and the american mind. 3rd Ed. New Haven: Yale University Press, 1982. Reiger, John F. American Sportsmen and the Orgins of Conservation. 3rd Ed. Corvallis: Oregon State University Press, 2001.

Muir, John. Nature Writings. Edited by William Cronon. New York: liberty of America, 1997. Turner, Frederick. Rediscovering America: John Muir in his time and ours. New York: Viking, 1985.