Steen, H. K. (2004). The U.S. Forest Service: A history (Centennial edition.). Forest History Society : University of Washington Press.
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Dyfyniad Arddull Chicago
Steen, Harold K. The U.S. Forest Service: A History. Centennial edition. Durham, North Carolina ; Seattle, Washington: Forest History Society : University of Washington Press, 2004.
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Dyfyniad MLA
Steen, Harold K. The U.S. Forest Service: A History. Centennial edition. Forest History Society : University of Washington Press, 2004.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.