Authentication Score 3
Citation
Leopold, Aldo. "The Land Ethic." A Sand County Almanac: And Sketches Here and There. Oxford University Press, 1949.
Conservation
Stegner, Wallace. Letter to David E. Pesonen. 3 Dec. 1960.
Stegner, Wallace. "The Best Idea We Ever Had." Marking the Sparrow's Fall: The Making of the American West. H. Holt, 1998, p. 137.
Leopold, Aldo. A Sand County Almanac: And Sketches Here and There. Oxford University Press, 1949, foreword.
Udall, Stewart. The Quiet Crisis. Holt, Rinehart and Winston, 1963, ch. 14.
Roosevelt, Theodore, Jr. Speech at the Grand Canyon. 6 May 1903, The Grand Canyon, AZ, USA.
Roosevelt, Theodore, Jr. "The Natural Wonder of the Grand Canyon." Great Speeches of the 20th Century, edited by Bob Blaisdell. Dover Publications, 2011.