“THE ENVIRONMENTAL IMPULSE.” A History of Environmental Politics Since 1945, by SAMUEL P. HAYS, University of Pittsburgh Press, Pittsburgh, Pa., 2000, pp. 22–35, www.jstor.org/stable/j.ctt6wrcjm.6. Accessed 9 July 2020.
HAYS, S. (2000). THE ENVIRONMENTAL IMPULSE. In A History of Environmental Politics Since 1945 (pp. 22-35). Pittsburgh, Pa.: University of Pittsburgh Press. Retrieved July 9, 2020, from www.jstor.org/stable/j.ctt6wrcjm.6
HAYS, SAMUEL P. "THE ENVIRONMENTAL IMPULSE." In A History of Environmental Politics Since 1945, 22-35. Pittsburgh, Pa.: University of Pittsburgh Press, 2000. Accessed July 9, 2020. www.jstor.org/stable/j.ctt6wrcjm.6.
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