Ecology, Nature

Cronon, William. Natureís Metropolis: Chicago and the Great West. 1991.
Crosby, Alfred W. Germs, Seeds and Animals: Studies in Ecological History. 1994.
Crosby, Alfred W., Jr. The Columbian Exchange: Biological and Cultural Consequences of 1492. 1972.
Merchant, Carolyn. Ecological Revolutions: Nature, Gender, & Science in New England. 1989.
Thoreau, Henry David. Walden. 1886.