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* Scheffer, Victor B. ''The Shaping of Environmentalism in America'' (1991).
* Strong, Douglas H. ''Dreamers & Defenders: American Conservationists.'' (1988) [http://www.questia.com/PM.qst?a=o&d=8516594 online edition], good biographical studies of the major leaders
* Turner, James Morton, "The Specter of Environmentalism": Wilderness, Environmental Politics, and the Evolution of the New Right. ''The Journal of American History'' 96.1 (2009): 123-47 [
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