Ward, J. G. D., P. J. Barry, W. H. Clerke, W. E. McDowell, and E. T. Wilson. 1974. Evaluation of southern pine beetle outbreaks on the Pisgah and Nantahala National Forests in North Carolina. United States Department of Agriculture, Forest Service, Southern Region, State and Private Forestry, Forest Pest Management, Report 74-1-11A.