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Out of Sight: Haze in Our National Parks ; How Power Plants Cost Billions in Visitor Enjoyment. Cambridge, MA: Abt Associates , 2000.
Out of the Blue. Pocket Books, 2004.
Out of the Mist. Pocket Books, 2003.
Out Under the Sky of the Great Smokies: A Personal Journal. Knoxville, TN: Greenbrier Press, 1975.
Out Under the Sky of the Great Smokies: A Personal Journal. The University of Tennessee Press, 2001.
Outdoor Guide to Bartram's Travels. University of Georgia Press, 2003.
Over the Misty Blue Hills: The Story of Cocke County, Tennessee. Easley, SC: Southern Historical Press, 1982.
Over the Misty Blue Hills: The Story of Cocke County, Tennessee. Newport, TN, 1950.
The Origins and Development of Cherokee Culture." In The Cherokee Indian Nation: A Troubled History, edited by Duane H. King, 3-32. Knoxville, TN: University of Tennessee Press, 1979.
"Our Native Land: or, Glances at American Scenery and Places, with Sketches of Life and Adventure.", 364-397. New York: D. Appleton and Company, 1886.
"Outline of the Geology of the Great Smoky Mountains Area, Tennessee and North Carolina." In Guide to Southeastern Geology, 395-427. The Geological Society of America, Inc.,, 1955.
"Observations of a White-Tailed Deer Die-Off in the Great Smoky Mountains National Park In 27th Annual Conference of the Southeastern Association of Game and Fish Commissioners. Vol. 27., 1973.
Ozone Biomonitoring Trend Plots and Surveys in Great Smoky Mountains National Park In Third Annual Southern Appalachian Man and the Biosphere Conference. Gatlinburg, TN: Tennessee Valley Authority, 1992.
Ozone Response of Selected Plant Species from the Great Smoky Mountains National Park In First Annual Southern Appalachian Man and the Biosphere Conference. Gatlinburg, TN: Tennessee Valley Authority, 1990.
The Original Great Smoky Mountain Video Journal. Maryville, TN: Image Network, 1995.
Origin of the Copper Deposits of the Ducktown Type in the Southern Appalachian Region. U.S. Department of the Interior, U.S. Geological Survey, 1935.
Oak forest around summit of Big Bald Mt.. The University of Tennessee Libraries Digital Collections: William Cox Cochran Great Smoky Mountains Photographic Collection, 1886.
Oak tree on state line between Low Gap and White Rock.. The University of Tennessee Libraries Digital Collections: Albert Gordon "Dutch" Roth Digital Photograph Collection, 1934.
Observation tower atop Clingmans Dome, landscape. Library of Congress Prints and Photographs Division: Historic American Engineering Record, 999.
Observation tower atop Clingmans Dome looking SE, portrait. Library of Congress Prints and Photographs Division: Historic American Engineering Record.
Ocanaluftee Ranger Station, Chicken House, U.S. Highway 441, Waynesville, Haywood County, NC. Library of Congress Prints and Photographs Division: Historic American Buildings Survey.
Oconaluftee Bridge, Spanning Oconaluftee River, Cherokee, Swain County, NC. Library of Congress Prints and Photographs Division: Historic American Engineering Record.
Oconaluftee Ranger Station, Apple House, U.S. Highway 441, Waynesville, Haywood County, NC. Library of Congress Prints and Photographs Division: Historic American Buildings Survey.
Oconaluftee Ranger Station, Barn, U.S. Highway 441, Waynesville, Haywood County, NC. Library of Congress Prints and Photographs Division: Historic American Buildings Survey.